6:47-51 The advantage of the manna was small, it only referred to this life; but the living Bread is so excellent, that the man who feedeth on it shall never die. This bread is Christ's human nature, which he took to present to the Father, as a sacrifice for the sins of the world; to purchase all things pertaining to life and godliness, for sinners of every nation, who repent and believe in him.
51. I am, &c.—Understand, it is of Myself I now speak as the Bread from heaven; of Meif a man eat he shall live for ever; and "THE Bread which i will give is my Flesh, which i will give for the life of the world." Here, for the first time in this high discourse, our Lord explicitly introduces His sacrificial death—for only rationalists can doubt this not only as that which constitutes Him the Bread of life to men, but as THAT very element IN Him which possesses the life-giving virtue.—"From this time we hear no more (in this discourse) of "Bread"; this figure is dropped, and the reality takes its place" [Stier]. The words "I will give" may be compared with the words of institution at the Supper, "This is My body which is given for you" (Lu 22:19), or in Paul's report of it, "broken for you" (1Co 11:24).