'Forever' in the Bible

Therefore, Naaman’s skin disease will cling to you and your descendants forever.” So Gehazi went out from his presence diseased—white as snow.

The Lord was unwilling to destroy Judah because of His servant David, since He had promised to give a lamp to David and his sons forever.

Manasseh set up the carved image of Asherah, which he made, in the temple that the Lord had spoken about to David and his son Solomon, “I will establish My name forever in this temple and in Jerusalem, which I have chosen out of all the tribes of Israel.