3:15 And Jesus answering said unto him, Suffer [it to be so] now: for thus it becometh us to fulfil {n} all righteousness. Then he suffered him.
(n) All such things as it has appointed for us to keep.
3:15 Suffer [it to be so] now. The term now implies that the relation of Jesus to his work made it proper that now he should be baptized. It is true that baptism was for sinners; Jesus was sinless; but he humbled himself, accepted the burden of human duties, and must set a perfect example to men. He obeyed the Jewish law, and it was needful also that he obey the Divine rite that John had inaugurated.
Thus it becometh us. In order to fulfill all righteousness, show forth a perfect obedience, set a perfect example, it became him to submit to the institution of baptism, and it became John to administer it to him. Us refers to Jesus and John.
3:15 It becometh us to fulfil all righteousness - It becometh every messenger of God to observe all his righteous ordinances. But the particular meaning of our Lord seems to be, that it becometh us to do (me to receive baptism, and you to administer it) in order to fulfil, that is, that I may fully perform every part of the righteous law of God, and the commission he hath given me.
3:13-17 Christ's gracious condescensions are so surprising, that even the strongest believers at first can hardly believe them; so deep and mysterious, that even those who know his mind well, are apt to start objections against the will of Christ. And those who have much of the Spirit of God while here, see that they need to apply to Christ for more. Christ does not deny that John had need to be baptized of him, yet declares he will now be baptized of John. Christ is now in a state of humiliation. Our Lord Jesus looked upon it as well becoming him to fulfil all righteousness, to own every Divine institution, and to show his readiness to comply with all God's righteous precepts. In and through Christ, the heavens are opened to the children of men. This descent of the Spirit upon Christ, showed that he was endued with his sacred influences without measure. The fruit of the Spirit is love, joy, peace, long-suffering, gentleness, goodness, faith, meekness, temperance. At Christ's baptism there was a manifestation of the three Persons in the sacred Trinity. The Father confirming the Son to be Mediator; the Son solemnly entering upon the work; the Holy Spirit descending on him, to be through his mediation communicated to his people. In Him our spiritual sacrifices are acceptable, for He is the altar that sanctifies every gift, 1Pe 2:5. Out of Christ, God is a consuming fire, but in Christ, a reconciled Father. This is the sum of the gospel, which we must by faith cheerfully embrace.