The Apostle Paul
1 Corinthians 11:27ESV·traditional attribution

Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty concerning the body and blood of the Lord.

John Calvin Reformed @genevareformer

27. Therefore he who shall eat this bread unworthily. If the Lord requires gratitude from us in the receiving of this sacrament — if he would have us acknowledge his grace with the heart, and publish it with the mouth — that man will not go unpunished, who has put insult upon him rather than honor; for the Lord will not allow his commandment to be despised.

Matthew Henry Presbyterian @wholebiblehenry

To rectify these gross corruptions and irregularities, the apostle sets the sacred institution here to view. This should be the rule in the reformation of all abuses. I. He tells us how he came by the knowledge of it. He was not among the apostles at the first institution; but he had received from the Lord what he delivered to them, Co1 11:23.

Commenting on 1 Corinthians 11:23-34

John Gill Reformed Baptist @doctorgill

But let a man examine himself,.... Whether he has a true sense of sin, sorrow and repentance for it; otherwise he will see no need of a Saviour, nor will he look to Christ for salvation, or be thankful to him for redemption by him; all which are necessary in a due observance of this ordinance; also, whether he is in the faith, whether he...