Christ's Divine Nature, Pre-Existent Glory, And Authority

That he is the bread which came down from heaven; this is often repeated here, v. 33, 50, 51, 58. This denotes, First, The divinity of Christ's person. As God, he had a being in heaven, whence he came to take our nature upon him: I came down from heaven, whence we may infer his antiquity, he was in the beginning with God; his ability, for heaven is the firmament of power; and his authority, he came with a divine commission. Secondly, The divine original of all that good which flows to us through him. He comes, not only katabas—that came down (v. 51), but katabainōn—that comes down; he is descending, denoting a constant communication of light, life, and love, from God to believers through Christ, as the manna descended daily; see Eph. 1:3.

Matthew Henry's Commentary on the Whole Bible, Bread of Life Discourse