'Fail' in the Bible

For God is compassionate. The LORD your God won't fail you. He won't destroy you or forget the covenant that he confirmed with your ancestors."

Then, when many evils and troubles will have come upon them, this song will serve as a witness against them, since their descendants won't fail to sing it. I know the plan that they are devising even before I bring them into the land that I promised them by an oath."