Deuteronomy 7:9-12

9Know therefore that Jehovah thy God, he is God, the faithful God, who keepeth covenant and lovingkindness with them that love him and keep his commandments to a thousand generations, 10and repayeth them that hate him to their face, to destroy them: he will not be slack to him that hateth him, he will repay him to his face. 11Thou shalt therefore keep the commandment, and the statutes, and the ordinances, which I command thee this day, to do them.

12And it shall come to pass, because ye hearken to these ordinances, and keep and do them, that Jehovah thy God will keep with thee the covenant and the lovingkindness which he sware unto thy fathers: