Cyril of Alexandria

Then they see a fire of coals, for the Saviour had kindled a fire miraculously, and put a fish upon it that He had caught by His ineffable power; and this too He had done of design. For it was not the hand of the holy Apostles, or the preaching of these spiritual fishermen among men, but the power of the Saviour that started the work. …

Commentary on the Gospel of John, Book 12 ↗

Theophylact of Ohrid

The coals, fish, and bread which the disciples now see also constitute a miracle. For He fed so many people with them not from ready-made material, as before in the wilderness with five loaves (John 6:9–12) and two fish, but simply, from nothing.

Commentary on John ↗

Augustine of Hippo

We must not understand that the bread was laid on the coals, but read it as if it stood, They saw a fire of coals there, and fish laid on the coals; and they saw bread.

Catena Aurea by Aquinas ↗

Gregory the Dialogist

In the midst of these things, both yesterday's reading of the holy Gospel and today's admonishes us that we ought to carefully consider why our Lord and Redeemer is recorded to have eaten roasted fish after his resurrection. For what is repeated in deed is not without mystery. For in this reading he ate bread and roasted fish, but in that which was read yesterday he ate with the roasted fish also a honeycomb. What do we believe the roasted fish signifies, except the Mediator himself between God and men who suffered? …

Forty Gospel Homilies, Homily 24 ↗

Thomas Aquinas

Next, the Evangelist tells how Christ affectionately prepared a meal for his disciples. He mentions its preparation; Christ's invitation; and the meal itself. In the preparation of the meal we see what was contributed by Christ, and what was brought by the disciples. Christ prepared three things. The Evangelist continues, When they got out on land, they saw hot coals there, with fish lying on it, and bread, which Christ by his power had created from nothing, or had formed from some nearby matter. …

Commentary on John ↗