
Ambrose of Milan
Catena Aurea · Matthäusevangelium 3
Then cometh Jesus from Galilee to Jordan unto John, to be baptized of him. But John forbad Him, saying, I have need to be baptized of Thee, and comest Thou to me? 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.
(Ambrosiaster. Serm. xii. 1.) Also like a wise master inculcating His doctrines as much by His own practice, as by word of mouth, He did that which He commanded all His disciples to do.