Gregory the Great
Catena Aurea · Matthäusevangelium 11
And it came to pass, when Jesus had made an end of commanding his twelve disciples, he departed thence to teach and to preach in their cities. Now when John had heard in the prison the works of Christ, he sent two of his disciples, And said unto him, Art thou he that should come, or do we look for another? Jesus answered and said unto them, Go and shew John again those things which ye do hear and see: The blind receive their sight, and the lame walk, the lepers are cleansed, and the deaf hear, the dead are raised up, and the poor have the Gospel preached to them. And blessed is he, whosoever shall not he offended in me.
(Hom. in Ev. vi. 1.) We must enquire how John, who is a prophet and more than a prophet, who made known the Lord when He came to be baptized, saying, Behold the Lamb of God, that taketh away the sins of the world!—why, when he was afterwards cast into prison, he should send his disciples to ask, Art thou he that should come, or look we for another? Did he not know Him whom he had pointed out to others; or was he uncertain whether this was He, whom by foretelling, by baptizing, and by making known, he had proclaimed to be He?