John Chrysostom

And He biddeth them "to bring of the fish," to show that what they saw was no appearance. But here indeed it saith not that He ate with them, but Luke, in another place, saith that He did; for "He was eating together with them." But the, "how," it is not ours to say; for these things came to pass in too strange a manner, not as though His nature now needed food, but from an act of condescension, in proof of the Resurrection.

Homily on the Gospel of John 87 ↗

Augustine of Hippo

"And Jesus cometh, and taketh bread, and giveth them, and fish likewise." We are likewise told here, you see, on what they dined; and of this dinner we also will say something that is sweet and salutary, if we, too, are made by Him to partake of the food. At the Lord's command they likewise brought of the fishes which they themselves had caught; and although their doing so might not be actually stated by the historian, yet there has been no silence in regard to the Lord's command. …

Tractates on John 123 ↗

Gregory the Dialogist

This does not differ from this reading either, for he ate fish and bread. For he who could be roasted like a fish from his humanity, refreshes us with bread from his divinity, who says: "I am the living bread who came down from heaven." Therefore he ate roasted fish and bread, so that by his own food he might show us that he both endured suffering from our humanity, and provided our refreshment from his divinity. If we consider this carefully, we see how it is also fitting for us to imitate. …

Forty Gospel Homilies, Homily 24 ↗

Thomas Aquinas

Next, Jesus came and took bread and gave it to them, and we see the meal they had, with Jesus eating with them: "You open your hand, you satisfy the desire of every living thing" (Ps 145:16). For he is the one who gives nourishment at the appropriate times. But did Christ really eat with them? We should say that he did, although it does not say this here. Luke (24:43) explicitly says that he ate with them, and in Acts (1:4) we read that "while eating with them, he charged them not to leave Jerusalem." But did he truly eat? …

Commentary on John ↗