Irenaeus

But if, when the Saviour came to this earth, He sent His apostles into the world to proclaim with accuracy His advent, and to teach the Father's will, having nothing in common with the doctrine of the Gentiles or of the Jews, much more, while yet existing in the Pleroma, would He have appointed His own heralds to proclaim His future advent into this world, and having nothing in common with those prophecies originating from the Demiurge. …

Irenaeus Against Heresies Book 4 ↗

Augustine of Hippo

Or else, The gift of the Holy Spirit being received, there is a kind of fast, which is of joy, which they who are already renewed to a spiritual life most seasonably celebrate. Before they receive this gift, He says they are as old garments, to which a new piece of cloth is most unsuitably sewed on, i. e. …

Catena Aurea by Aquinas ↗

Ambrose of Milan

Then in this passage, fasting represents the old garment that the apostle thought should be taken off. He said, "Strip yourselves of the old man with his deeds," so that we may put on the new man, which is renewed by the sanctification of baptism. Then the series of teachings is suited to the same garment, lest we mix the deeds of the old and the new man, when the physical exterior performs the works of the flesh. …

Commentary on Luke ↗

Bede

He also spoke a parable to them: No one puts a piece from a new garment on an old one; otherwise, he will tear the new, and the piece from the new will not match the old. When the Lord was asked why his disciples did not fast, he replied that those still carnal, not yet strengthened by the faith in his passion and resurrection, could not bear the stricter fasting and continence commands, lest through excessive austerity, they lose even the faith they seemed to have. …

On the Gospel of Luke ↗