John 6:51 - Joseph Benson’s Commentary on the Old and New Testaments

I am the living bread Because it was a matter of infinite importance to his hearers that they should form a just judgment of his ability to save them, and believe in him as the Saviour of the world, he affirmed a third time that he was himself the living bread, which came down from heaven to make and keep men alive to God. and render them immortal; and that all who did eat of it should live for ever, because he was about to give them his flesh to eat, by making it an expiation for the sins of the world. The intelligent reader will observe that there is a beautiful gradation in our Lord's discourse. The first time that he called himself the bread of life, (John 6:35,) he assigned the reason of the name somewhat obscurely: He that cometh to me shall never hunger, &c. The second time he called himself the bread of life, (John 6:47,) he spake more plainly: He that believeth on me hath everlasting life; therefore, I am the bread of life. And by connecting this with the affirmation, (John 6:46,) that he was the only teacher of mankind that had ever personally seen, and conversed intimately with, the Father, he intimated that he gave life to men by his doctrine, being on that account also the bread of life. The third time he called himself bread, he added to the name the epithet of living; not only because he gives life to men by quickening their souls, raising their bodies from the dead, and making them eternally happy, but because he giveth them life in these senses, by means of his human nature, which was not an inanimate thing, like the manna, but a living substance. For he told them plainly, that the bread which he would give them was his flesh, which he would give for the life of the world And spake of men's eating it in order to its having that effect. But the meaning of this expression he had directed them to before, when, in calling himself the bread of life, he always joined believing on him as necessary to men's living by him. Wherefore to eat, in the remaining part of this discourse, is to believe. See Macknight.