Verse-by-Verse Commentary
The Book of Psalms
Chapter 81: Open Thy Mouth Wide
Psalm 81 opens with a summons to loud, festal worship, 'Sing aloud unto God our strength: make a joyful noise unto the God of Jacob,' with timbrel and harp and the trumpet of the new moon. Then, abruptly, the music stops and God Himself speaks. He recalls how He brought Israel out of Egypt, presses the first commandment upon them, 'There shall no strange god be in thee,' and makes a staggering promise: 'I am the LORD thy God, which brought thee out of the land of Egypt: open thy mouth wide, and I will fill it.' But His people would not hearken; and so the psalm closes on the saddest note in all the Psalter, the sigh of a grieving God, 'Oh that my people had hearkened unto me,' and a catalogue of the blessing they forfeited, down to 'honey out of the rock.' Here is the heart of God, longing to fill His people, met by hearts that will not open, and the LORD who speaks it is the Lord Jesus Christ, the bread of life and the smitten Rock from whom the honey flows.
About This Commentary
This is a verse-by-verse study of Psalm 81, Asaph's festal psalm in which God calls His people to worship and then pleads with them to hearken to His voice. For each section you will find the KJV text, the Hebrew words that sharpen the meaning, plain explanation, and a Gospel Focus. Every Scripture quotation is from the King James Version.
Blow Up the Trumpet in the New Moon (Psalm 81:1-3)
A summons to loud, whole-hearted, festal worship.
Sing Aloud unto God Our Strength
"To the chief Musician upon Gittith, A Psalm of Asaph. Sing aloud unto God our strength: make a joyful noise unto the God of Jacob. Take a psalm, and bring hither the timbrel, the pleasant harp with the psaltery. Blow up the trumpet in the new moon, in the time appointed, on our solemn feast day."
Word Study
"Sing aloud," Hebrew harninu (הַרְנִינוּ), shout for joy, sing ringingly. The psalm opens at full volume. This is no murmured devotion but a ringing, carrying sound, the voice lifted as high as it will go in gladness.
"God our strength," Elohim uzzenu (אֱלֹהִים עוּזֵּנוּ). The singing has a reason built into its object: "Sing aloud unto God our strength." They do not praise strength in the abstract but the God who has been strength to them.
"make a joyful noise," hari'u (הָרִיעוּ), raise a shout, the war-cry and festal-cry. The same shout that went up on the battlefield goes up at the feast. Worship here has the volume and the urgency of an army's cry, turned now to gladness before "the God of Jacob."
"timbrel," tof (תֹּף), the hand-drum. "Take a psalm, and bring hither the timbrel." The summons calls for percussion as well as voice; the drum sets the beat that carries a whole congregation together.
"pleasant harp," kinnor na'im (כִּנּוֹר נָעִים). To the drum is added the sweetness of strings, "the pleasant harp with the psaltery." The psalm summons the full orchestra of Israel's praise, voice, drum, harp, and psaltery alike.
"blow up the trumpet," tik'u shofar (תִּקְעוּ שׁוֹפָר). Last comes the ram's-horn trumpet, the instrument that announces rather than accompanies: "Blow up the trumpet in the new moon." Its blast calls the nation to assemble.
"in the new moon," bachodesh (בַּחֹדֶשׁ). The celebration is not left to impulse but set by the calendar, "in the new moon, in the time appointed." Israel's joy came round at fixed seasons, appointed by God rather than chosen by mood.
"solemn feast day," chag (חָג). The word means a pilgrim festival, a day of loud, ringing celebration kept before the LORD. What is commanded here is gladness, and gladness of a very public kind.
Explanation
Two things sharpen this opening call. First, mark the object of the joy: "Sing aloud unto God our strength... the God of Jacob." The praise is loud and exuberant, but it is not empty noise; it is directed at a specific truth about God, that He is our strength. Israel does not sing to work itself up into strength; it sings because God is its strength already. And "the God of Jacob" is deliberate, Jacob the supplanter, the weak and crooked man whom God carried, so that "the God of Jacob" means the God who makes something of the undeserving. Loud worship rests on solid ground: who God is, and what He has been to the weak. Second, notice the timing, "blow up the trumpet in the new moon... on our solemn feast day." The trumpet blown at the new moon points to the Feast of Trumpets (Leviticus 23:24), which fell on the new moon of the seventh month and opened Israel's most solemn season, leading on to the Day of Atonement and the Feast of Tabernacles. The trumpet did not merely make music; it summoned, calling the scattered people to gather before God, and heralding the season of redemption. So this festal shout is not entertainment but a holy convocation: God's people, called by the trumpet, gathering to rejoice in the God who is their strength. And then, having gathered them by the trumpet, God Himself will speak, for the very next verses turn from the people's praise to God's own voice.
Gospel Focus
"Sing aloud unto God our strength", for the believer, that strength has a name and a face. Christ is our strength: "I can do all things through Christ which strengtheneth me" (Philippians 4:13), and "the joy of the LORD is your strength" (Nehemiah 8:10). We do not gather our own strength and then serve God; we sing to Him who is our strength, and are strengthened in the singing. And the trumpet that summoned Israel to her solemn feast still sounds, for the great convocation is yet to come. As the trumpet gathered the scattered tribes, so "the trumpet shall sound, and the dead shall be raised incorruptible" (1 Corinthians 15:52), and "the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God" (1 Thessalonians 4:16). The Feast of Trumpets opened the season that led to atonement; Christ our atonement has come, and the last trump will gather His people to the marriage supper of the Lamb. So make a joyful noise now: worship is the rehearsal of heaven, and the God our strength whom we praise is the Lord Jesus Christ.
I Am the LORD Thy God (Psalm 81:8-10)
The God who redeems presses the first commandment, and makes a staggering promise.
Open Thy Mouth Wide, and I Will Fill It
"Hear, O my people, and I will testify unto thee: O Israel, if thou wilt hearken unto me; There shall no strange god be in thee; neither shalt thou worship any strange god. I am the LORD thy God, which brought thee out of the land of Egypt: open thy mouth wide, and I will fill it."
Word Study
"Hear," Hebrew shema (שְׁמַע), hear with heed, obey. "Hear, O my people." The word asks for more than an open ear; in Hebrew, to hear is to heed, so the call to listen is already a call to obey.
"I will testify," a'idah (אָעִידָה), solemnly warn, bear witness against. God speaks as one giving evidence: "Hear, O my people, and I will testify unto thee." What follows is not casual advice but sworn testimony, with all the weight of a warning behind it.
"hearken," tishma-li (תִּשְׁמַע־לִי). "O Israel, if thou wilt hearken unto me." The sentence hangs open on an "if," and everything that follows in the psalm depends on how His people answer it.
"strange god," el zar (אֵל זָר), a foreign god. "There shall no strange god be in thee; neither shalt thou worship any strange god." The demand is exclusive: no outsider is to be given room in the house that belongs to the LORD.
"I am the LORD thy God," anochi YHWH Eloheykha (אָנֹכִי יְהוָה אֱלֹהֶיךָ). God grounds His claim in redemption, "I am the LORD thy God, which brought thee out of the land of Egypt." He asks nothing on the strength of bare authority; He asks it as the God who has already delivered them.
"open thy mouth wide," harchev pikha (הַרְחֶב פִּיךָ). The command that follows is not a burden but an invitation to expect much. The only limit set on the asking is the size of the mouth opened.
"I will fill it," va'amal'ehu (וַאֲמַלְאֵהוּ). The claim closes with a promise as wide as an open mouth: "open thy mouth wide, and I will fill it." Whatever room His people make for Him, God undertakes to fill.
Explanation
Look closely at how God argues here, and at the astonishing promise He ends with. First, the pattern of verse 10 is the exact pattern of the Ten Commandments. God says, "I am the LORD thy God, which brought thee out of the land of Egypt," and only then, "There shall no strange god be in thee." That is precisely the order of Sinai: "I am the LORD thy God, which have brought thee out of the land of Egypt, out of the house of bondage. Thou shalt have no other gods before me" (Exodus 20:2-3). God does not demand loyalty first and prove Himself later; He first reminds them what He has already done, redeemed them from slavery, and grounds the command in the grace. Obedience is the response of the redeemed, not the price of redemption. Second, and most wonderful, is the promise attached: "open thy mouth wide, and I will fill it." The picture is of a hungry nestling, a baby bird stretching its beak as wide as it can toward the parent, and the promise is that God will fill whatever capacity we bring. The limit on His giving is not His supply but our expectation. He does not say, "open thy mouth a little"; He says "wide." Most of our poverty is that we come to God with our mouths nearly shut, asking little, expecting little, and so receiving little, not because He is stingy but because we will not open wide. The God who filled a nation in the wilderness with bread from heaven says: bring Me your emptiest, widest hunger, and I will fill it. Yet the tragedy comes in the very next verse, "But my people would not hearken to my voice" (v11). Offered a God who would fill them to the brim, they shut their mouths and turned to strange gods that could not feed them at all.
Gospel Focus
"I am the LORD thy God, which brought thee out of the land of Egypt", the One who spoke these words is the One who became flesh for us, for the Rock that followed Israel through the wilderness "was Christ" (1 Corinthians 10:4). The LORD who redeemed them from Egypt is the Lord Jesus who redeems us from sin, and the same order holds: He saves us first, wholly by grace, and then calls us to have no other gods, "we love him, because he first loved us" (1 John 4:19). And the promise "open thy mouth wide, and I will fill it" finds its fullness in Christ, the bread of life: "he that cometh to me shall never hunger; and he that believeth on me shall never thirst" (John 6:35). He satisfies the widest hunger the soul can bring, for "blessed are they which do hunger and thirst after righteousness: for they shall be filled" (Matthew 5:6), and "he satisfieth the longing soul, and filleth the hungry soul with goodness" (Psalm 107:9). The gospel is not a call to bring God a full mouth of merit but an empty mouth of need, opened wide in faith. So do not come to Christ asking little. Open wide, confess the whole depth of your hunger, and He will fill it, "the young lions do lack, and suffer hunger: but they that seek the LORD shall not want any good thing" (Psalm 34:10).
Honey Out of the Rock (Psalm 81:13-16)
The grieving sigh of God over blessing His people would not receive.
Oh That My People Had Hearkened unto Me
"Oh that my people had hearkened unto me, and Israel had walked in my ways! I should soon have subdued their enemies, and turned my hand against their adversaries. The haters of the LORD should have submitted themselves unto him: but their time should have endured for ever. He should have fed them also with the finest of the wheat: and with honey out of the rock should I have satisfied thee."
Word Study
"Oh that," Hebrew lu (לוּ), if only, a word of longing and lament. The psalm ends not in anger but in grief. This is the sound of a wish that cannot now be granted, God Himself sighing over what might have been.
"had hearkened," shomea li (שֹׁמֵעַ לִי). "Oh that my people had hearkened unto me." The whole tragedy turns on the one thing God asked for earlier in the psalm and did not receive: a listening people.
"walked in my ways," bidrakhai yehalleku (בִּדְרָכַי יְהַלֵּכוּ). Hearing was meant to become walking: "and Israel had walked in my ways!" Obedience is pictured as a road taken step by step, not a single decision made once.
"subdued," akhnia (אַכְנִיעַ). Then God lists all the good He would have done, beginning with victory: "I should soon have subdued their enemies." The enemies that mastered Israel would have been brought low, and quickly.
"finest of the wheat," chelev chittah (חֵלֶב חִטָּה), literally the fat of wheat, the richest of the grain. After victory and security comes the richest food: "He should have fed them also with the finest of the wheat." Not bare provision but the best of the harvest was on offer.
"honey out of the rock," udevash mitzur (וּמִצּוּר דְּבַשׁ). The last picture is sweetness drawn from the least likely place: "with honey out of the rock should I have satisfied thee." Even the bare stone would have yielded delight to an obedient people.
Explanation
This is one of the most moving passages in all the Psalter, and its power lies in a single grammatical thread: everything here is in the tragic conditional, the mood of what would have been. "I should soon have subdued their enemies... the haters of the LORD should have submitted... He should have fed them." Verse after verse catalogues blessing, victory over enemies, security that "should have endured for ever," the richest food, and every line of it is what God longed to give but could not, because "my people would not hearken." It is the saddest kind of list: a register of forfeited good. God is not gloating over judgment; He is grieving over gifts refused. The word that opens it, "Oh that," is the sigh of a Father who wanted to give and was not allowed to. And notice the last and strangest gift named: "with honey out of the rock should I have satisfied thee." Honey does not come from rock; rock is the hardest, driest, most barren thing. Yet God says He would have drawn the sweetest food from the least likely place, echoing the song of Moses, where God "made him to suck honey out of the rock" (Deuteronomy 32:13). This is the signature of God's provision: sweetness out of hardness, satisfaction out of barrenness, the impossible made a table. All of it was on offer; all of it was refused. The psalm leaves the offer standing, and lets the ache of it search the reader: what is God longing to give you that you will not open your mouth to receive?
Gospel Focus
"Oh that my people had hearkened unto me", this is the very grief that broke from the heart of God made flesh. Standing over the city that would not receive Him, Jesus wept the same lament: "O Jerusalem, Jerusalem, thou that killest the prophets... how often would I have gathered thy children together, even as a hen gathereth her chickens under her wings, and ye would not!" (Matthew 23:37). The "Oh that" of Psalm 81 and the "how often would I... and ye would not" of the gospel are one and the same longing heart. And the two foods God offered point straight to Christ. "The finest of the wheat" is the true bread, the Lord Jesus, "the corn of wheat" that fell into the ground and died to bring forth much fruit (John 12:24), the bread of life that satisfies for ever. And "honey out of the rock", the sweetest supply from the hardest place, is fulfilled in Christ the smitten Rock, for "that Rock was Christ" (1 Corinthians 10:4), and from His stricken side flow living water and all the sweetness of the gospel. From the hard place of the cross comes the honey of salvation. So do not let this be a psalm of "what might have been" for your own soul. Hearken to His voice, open your mouth wide, and taste; "O taste and see that the LORD is good: blessed is the man that trusteth in him" (Psalm 34:8).
Psalm in Review
Psalm 81 begins as a festival and ends as a lament. It opens with a summons to loud, whole-hearted worship, voice and timbrel and harp and the trumpet of the new moon, gathering God's people to rejoice in "God our strength." Then God Himself speaks, pressing the first commandment upon a redeemed people, "There shall no strange god be in thee," and grounding it, as at Sinai, in the grace that came first: "I am the LORD thy God, which brought thee out of the land of Egypt." To that redeemed people He makes the widest promise in Scripture, "open thy mouth wide, and I will fill it," measuring His giving only by their hunger. But "my people would not hearken," and so the psalm closes on the grieving sigh of God, "Oh that my people had hearkened unto me," followed by a register of forfeited blessing, victory, security, "the finest of the wheat," and "honey out of the rock," all that God longed to give and was refused. Every strand is fulfilled in the Lord Jesus Christ: the strength of His people, the LORD who redeemed them, the bread of life who fills the open mouth, and the smitten Rock from whom the honey flows. And His grief is the grief that wept over Jerusalem. Psalm 81 leaves the offer standing and searches the heart: God is longing to fill you; will you open wide and hearken, or will your life be a psalm of what might have been?
Key Takeaways
- Worship rests on who God is. "Sing aloud unto God our strength", loud joy grounded in solid truth.
- Grace comes before command. "I brought thee out of Egypt" precedes "no strange god", obedience is the response of the redeemed.
- The limit is our hunger. "Open thy mouth wide, and I will fill it", God's giving is bounded only by our expectation.
- God grieves refused gifts. "Oh that my people had hearkened", His heart aches over blessing we will not receive.
- Sweetness from the hard place. "Honey out of the rock", fulfilled in Christ the smitten Rock.
Questions for Reflection
- Is your worship rooted in the truth that God is your strength, or is it mere noise?
- Do you serve God as one already redeemed, or as one trying to earn His favour?
- Do you come to God with your mouth barely open, asking and expecting little?
- Is there blessing God is longing to give you that you have refused to receive?
- Have you tasted the honey from the smitten Rock, the sweetness of Christ crucified?
References
- Scripture: Psalm 81:1-16, King James Version (commentary focuses on verses 1-3, 8-10, and 13-16).
- Cross-references: Exodus 20:2-3; Leviticus 23:24; Deuteronomy 32:13; Nehemiah 8:10; Psalm 34:8, 10; 107:9; Matthew 5:6; 23:37; John 6:35; 12:24; 1 Corinthians 10:4; 15:52; Philippians 4:13; 1 Thessalonians 4:16; 1 John 4:19.
- Hebrew word meanings: standard lexical sources (Strong's, BDB) for harninu ("sing aloud, shout for joy"), shema ("hear, obey"), harchev pikha ("open thy mouth wide"), lu ("oh that, if only"), and chelev chittah ("finest, the fat of wheat").