'Forever' in the Bible

then you shall tell them, 'Because the waters of the Jordan were cut off before the ark of the covenant of Yahweh. When it passed over the Jordan, the waters of the Jordan were cut off. These stones shall be for a memorial to the children of Israel forever.'"

that all the peoples of the earth may know the hand of Yahweh, that it is mighty; that you may fear Yahweh your God forever.'"

So Joshua burnt Ai, and made it a heap forever, even a desolation, to this day.

Moses swore on that day, saying, 'Surely the land where you walked shall be an inheritance to you and to your children forever, because you have wholly followed Yahweh my God.'