“When all the people were baptized, it came to pass that Jesus also was baptized; and while He prayed, the heaven was opened. And the Holy Spirit descended in bodily form like a dove upon Him, and a voice came from heaven which said, “You are My beloved Son; in You I am well pleased.” Luke 3:21-22
In this passage we find Christ asking to be baptized by John (baptism is a representation of a person dying to sin and being resurrected to a righteous life). Jesus did not have to be baptized because He had no sin, nonetheless He said to John: “Permit it to be so now, for thus it is fitting for us to fulfill all righteousness.” During His baptism, the Father and the Holy Spirit witnessed that He was indeed the Son of God. Jesus was given authority by the Father.
Christ has authority, given by God, over every Christian. What He commands, we ought to obey. Following His example, He asks us to be baptized as a testimony of our new life and calls us to fulfill all righteousness.