John Chrysostom

"For I received of the Lord," saith he, "that which also I delivered unto you: how that the Lord Jesus in the night in which He was betrayed, took bread: And when He had given thanks, He brake it, and said, Take, eat: this is My Body, which is broken for you: this do in remembrance of me." Wherefore doth he here make mention of the Mysteries? Because that argument was very necessary to his present purpose. …

Homily on 1 Corinthians 27 ↗

Theophylact of Ohrid

Remember, he says, that He delivered this sacrament to you last of all, moreover on the night in which He was handed over to slaughter, and He did not exclude His betrayer from the table, yet you despise your brother. You were taught to give thanks, for He too gave thanks, to give us a model, yet you do things unworthy of thanksgiving, for you dishonor the Church, and while another goes hungry, you drink to excess. …

Commentary on 1 Corinthians ↗

Cyprian

Moreover, the blessed Apostle Paul, chosen and sent by the Lord, and appointed a preacher of the Gospel truth, lays down these very things in his epistle, saying, "The Lord Jesus, the same night in which He was betrayed, took bread; and when He had given thanks, He brake it, and said, This is my body, which shall be given for you: do this in remembrance of me. After the same manner also He took the cup, when he had supped, saying, This cup is the new testament in my blood: this do, as oft as ye drink it, in remembrance of me. …

Epistle LXII ↗

Thomas Aquinas

After rebuking the Corinthians for their unbecoming behavior, when they came together to take the Eucharist, the Apostle now deals with the sacrament itself. First, he discusses the dignity of this sacrament; secondly, he urges the faithful to receive it reverently (v. 27). In regard to the first he does two things: first, he commends the authority of the doctrine he is about to deliver; secondly, he presents the doctrine about the dignity of this sacrament (v. 23b). …

Commentary on 1 Corinthians ↗