'Forever' in the Bible

then you shall say to them that the waters of the Jordan were cut off before the ark of the covenant of the Lord; when it crossed the Jordan, the waters of the Jordan were cut off. So these stones shall become a memorial for Israel forever.”

so that all the peoples of the earth may know [without any doubt] and acknowledge that the hand of the Lord is mighty and extraordinarily powerful, so that you will fear the Lord your God [and obey and worship Him with profound awe and reverence] forever.”