'Forever' in the Bible

They sang, praising and giving thanks to the Lord, saying, “For He is good, for His lovingkindness is upon Israel forever.” And all the people shouted with a great shout when they praised the Lord because the foundation of the house of the Lord was laid.

So now do not give your daughters to their sons nor take their daughters to your sons, and never seek their peace or their prosperity, that you may be strong and eat the good things of the land and leave it as an inheritance to your sons forever.’