Because Jesus was baptized and wants us to baptize others.
In Matthew 3:16, we learn about the time when Jesus Himself was baptized before He started His ministry on earth. If the Son of God pursued baptism, so should we. Later, Jesus told us in Matthew 28:19-20 He wants us to spread His message of love. He told us to continue baptizing and being baptized! Okay, Jesus. We’re happy to obey.
When we go down into the water, we’re reminded of Jesus’ death on the cross and His payment for our sins. But when we come out of the water, we’re reminded that three days later, Jesus rose from the dead! 2 Corinthians 5:17 tells us that if we’re in Christ, we’re new creations. Baptism reminds us that the old is gone, and the new has come!
When we go down into the water, we’re reminded of Jesus’ death on the cross and His payment for our sins. But when we come out of the water, we’re reminded that three days later, Jesus rose from the dead! 2 Corinthians 5:17 tells us that if we’re in Christ, we’re new creations. Baptism reminds us that the old is gone, and the new has come!
" And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him:"
Matthew 3:16