Deuteronomy 7:9-12

9Know therefore that the Lord your God is God, the faithful God who keeps covenant and steadfast love with those who love him and keep his commandments, to a thousand generations,

10and repays to their face those who hate him, by destroying them. He will not be slack with one who hates him. He will repay him to his face.

11You shall therefore be careful to do the commandment and the statutes and the rules that I command you today.

12"And because you listen to these rules and keep and do them, the Lord your God will keep with you the covenant and the steadfast love that he swore to your fathers.