Psalm 78:9

7That they might set their hope in God, and not forget the works of God, but keep his commandments:

8And might not be as their fathers, a stubborn and rebellious generation; a generation that set not their heart aright, and whose spirit was not stedfast with God.

9The children of Ephraim, being armed, and carrying bows, turned back in the day of battle.

10They kept not the covenant of God, and refused to walk in his law;

11And forgat his works, and his wonders that he had shewed them.