John Chrysostom — as excerpted in the Catena Aurea on John 6:28-34

“(Hom. xxv. 1) Our Lord might have replied, that He had done miracles greater than Moses: but it was not the time for such a declaration. One thing He desired, viz. to bring them to taste the spiritual meat: then Jesus said unto them, Verily, verily, I say unto you, Moses gave you not that bread from heaven; but My Father giveth you the true bread from heaven. Did not the manna come from heaven? True, but in what sense did it? The same in which the birds are called, the birds of heavenk; and just as it is said in the Psalm, The Lord thundered out of heaven. (Ps. 17) He calls it the true bread, not because the miracle of the manna was false, but because it was the figure, not the reality. He does not say too, Moses gave it you not, but I: but He puts God for Moses, Himself for the manna.”