Matthew 3:15

15 Jesus replied, “Let it be so now; it is proper for us to do this to fulfill all righteousness.” Then John consented.

Read Matthew 3:15 Using Other Translations

And Jesus answering said unto him,Suffer it to be so now: for thus it becometh us to fulfil all righteousness. Then he suffered him.
But Jesus answered him, "Let it be so now, for thus it is fitting for us to fulfill all righteousness." Then he consented.
But Jesus said, “It should be done, for we must carry out all that God requires. ” So John agreed to baptize him.