The New John Gill Exposition of the Entire BibleJohn 6:52
The Jews therefore strove among themselves…
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,
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.