John the Apostle
John 6:51BSB·traditional attribution

I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. And this bread, which I will give for the life of the world, is My flesh.”

John Calvin Reformed @genevareformer

51. I am the living bread. He often repeats the same thing, because nothing is more necessary to be known; and every one feels in himself with what difficulty we are brought to believe it, and how easily and quickly it passes away and is forgotten.

Matthew Henry Presbyterian @wholebiblehenry

Whether this conference was with the Capernaites, in whose synagogue Christ now was, or with those who came from the other side of the sea, is not certain nor material; however, it is an instance of Christ's condescension that he gave them leave to ask him questions, and did not resent the interruption as an affront, no, not from his common hearers, though not his immediate followers.

Commenting on John 6:28-59

John Gill Reformed Baptist @doctorgill

Then Jesus said unto them,.... The Jews, who were litigating this point among themselves: verily, verily, I say unto you; or you may assure yourselves of the truth of what follows, except ye eat the flesh of the son of man, and drink his blood, ye have no life in you: by "the son of man", Christ means himself; under which title he often speaks...