Deuteronomy 7:9 KJV
Know therefore that the LORD thy God, he is God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;
Deuteronomy 7:7–11 KJV Chapter Context
7
The LORD did not set his love upon you, nor choose you, because ye were more in number than any people; for ye were the fewest of all people:
8
But 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.
9
Know therefore that the LORD thy God, he is God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;
10
And 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.
11
Thou shalt therefore keep the commandments, and the statutes, and the judgments, which I command thee this day, to do them.