'Forever' in the Bible

I am the living bread that came down out of heaven; if anyone eats of this bread, he will live forever; and the bread also which I will give for the life of the world is My flesh.”

This is the bread which came down out of heaven; not as the fathers ate and died; he who eats this bread will live forever.”

The slave does not remain in the house forever; the son does remain forever.

The crowd then answered Him, “We have heard out of the Law that the Christ is to remain forever; and how can You say, ‘The Son of Man must be lifted up’? Who is this Son of Man?”

I will ask the Father, and He will give you another Helper, that He may be with you forever;