John 6:49

Your fathers ate the manna in the wilderness, and they died. This is the bread which cometh down out of heaven, that a man may eat thereof and not die. I am the living bread which came down out of heaven: if any man eat of this bread, he shall live for ever: yea, and the bread which I will give is my flesh, for the life of the world.

These verses are a recapitulation of the Lord's teachings in John 6:32-33, and with the additional new element regarding his crucifixion, that is, giving "his flesh" for the life of the world. For contrast between the manna and the true bread, see under John 6:32-33. "Flesh" in this context is a reference to the human body of the Lord, and is not used in the sense that Paul sometimes used the term. It was the human life of the divine Saviour that was sacrificed on the cross to provide bread for all men unto eternal life, bread appearing in this metaphor as the principal and dominating element of human diet. Christ is the soul's true food.