'Forever' in the Bible

And the Lord God said, “Behold, the man has become like one of Us (Father, Son, Holy Spirit), knowing [how to distinguish between] good and evil; and now, he might stretch out his hand, and take from the tree of life as well, and eat [its fruit], and live [in this fallen, sinful condition] forever”—

Then the Lord said, “My Spirit shall not strive and remain with man forever, because he is indeed flesh [sinful, corrupt—given over to sensual appetites]; nevertheless his days shall yet be a hundred and twenty years.”

for all the land which you see I will give to you and to your descendants forever.

I will be security (a guarantee) for him; you may hold me [personally] responsible for him. If I do not bring him [back] to you and place him [safely] before you, then let me bear the blame before you forever.

For your servant became security for the young man to my father, saying, ‘If I do not bring him back to you, then let me bear the blame before my father forever.’