Deuteronomy 7:9
King James Version
“Know therefore that the LORD thy God, he God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;”
Context
6For thou an holy people unto the LORD thy God: the LORD thy God hath chosen thee to be a special people unto himself, above all people that upon the face of the earth.
7The LORD did not set his love upon you, nor choose you, because ye were more in number than any people; for ye the fewest of all people:
8But because the LORD loved you, and because he would keep the oath which he had sworn unto your fathers, hath the LORD brought you out with a mighty hand, and redeemed you out of the house of bondmen, from the hand of Pharaoh king of Egypt.
9Know therefore that the LORD thy God, he God, the faithful God, which keepeth covenant and mercy 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 commandments, and the statutes, and the judgments, which I command thee this day, to do them.
12Wherefore it shall come to pass, if ye hearken to these judgments, and keep, and do them, that the LORD thy God shall keep unto thee the covenant and the mercy which he sware unto thy fathers: