John Gill Commentary John 6:52

"The Jews therefore strove one with another, saying, How can this man give us his flesh to eat?" — John 6:52 (ASV)

The Jews therefore strove among themselves
Fell to cavilling and disputing one among another; some understanding Christ, and others not; some being for him, and vindicated what he said; and others being against him, and who were the majority, objected,

saying how can this man give us his flesh to eat ?
which is to be understood, not physically, but as morally impossible and unlawful; since, with the Jews, it was not lawful to eat the flesh of any creature alive, and much less the flesh of man; for the Jews understood Christ of a corporeal eating of his flesh, being strangers to a figurative or spiritual eating of it by faith, in which sense he meant it.