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Jesus' baptism was not as a repentance of sins. His baptism was to identify himself with us, and our baptism is to identify ourselves with him and his saving work on the cross.
21 Baptism, which corresponds to this, now saves you, not as a removal of dirt from the body but as an appeal to God for a good conscience, through the resurrection of Jesus Christ, 22 who has gone into heaven and is at the right hand of God, with angels, authorities, and powers having been subjected to him. 1 Peter 3:21 — 1 Peter 3:22 ESV