This is that bread ... - This is the true bread that came down. The word “that” should not be in the translation.
Shall live for ever - Not on the earth, but in the enjoyments of a better world.
Related Commentaries of John 6:58
John 6:58
58 This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever.