'Forever' in the Bible

All the raised offerings of the holy things that the Israelites offer to the Lord, I have given to you, and to your sons and daughters with you, as a perpetual ordinance. It is a covenant of salt forever before the Lord for you and for your descendants with you."

Ships will come from the coast of Kittim, and will afflict Asshur, and will afflict Eber, and he will also perish forever."