Deuteronomy 7:9–11

Know therefore that the LORD your God himself is God, the faithful God, who keeps covenant and loving kindness to a thousand generations with those who love him and keep his commandments, and repays those who hate him to their face, to destroy them. He will not be slack to him who hates him. He will repay him to his face. You shall therefore keep the commandments, the statutes, and the ordinances which I command you today, to do them.