What Does the Bible Say About Baptism?

Acts 2:38 NKJV

"Then Peter said to them, "Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit.""

This is the Apostolic answer to "What shall we do?", baptism in the name of Jesus Christ is presented as necessary for the remission of sins.

Acts 8:16 NKJV

"For as yet He had fallen upon none of them. They had only been baptized in the name of the Lord Jesus."

Philip baptized the Samaritans in the name of the Lord Jesus, not a Trinitarian formula. This is consistent with the pattern across all Acts baptisms.

Acts 10:48 NKJV

"And he commanded them to be baptized in the name of the Lord. Then they asked him to stay a few days."

Even the Gentiles (Cornelius's household) were baptized in the name of the Lord, not at arm's length from the gospel but receiving the same Acts 2:38 experience.

Romans 6:3-4 NKJV

"Or do you not know that as many of us as were baptized into Christ Jesus were baptized into His death? Therefore we were buried with Him through baptism into death, that just as Christ was raised from the dead by the glory of the Father, even so we also should walk in newness of life."

Paul explains the spiritual meaning of baptism: burial with Christ and resurrection to new life. It is not a symbol after salvation, it is a participation in the death and resurrection of Jesus.