Psalm 50:22 Now consider this, ye that forget God, lest I tear you in pieces, and there be none to deliver.
GodSmack!
Psalm 9:17 The wicked shall be turned into hell, and all the nations that forget God.
Deuteronomy 8:19 And it shall be, if thou do at all forget the LORD thy God, and walk after other gods, and serve them, and worship them, I testify against you this day that ye shall surely perish.
Proverbs 29:1 He, that being often reproved hardeneth his neck, shall suddenly be destroyed, and that without remedy.