Deuteronomy 7:9

9 And thou shalt know that Jehovah thy God, he is God, the faithful God, who keepeth covenant and mercy to a thousand generations with them that love him and keep his commandments;

Deuteronomy 7:9 Meaning and Commentary

Ver. 9 Know therefore that the Lord thy God, he is God
The only true and living God, and not the idols of the Gentiles, who are false and lifeless ones, and therefore not the proper objects of adoration:

the faithful God, which keepeth covenant and mercy;
as appeared by fulfilling the promise made to their fathers, in bringing them out of Egypt, and now them to the borders of the land of Canaan given them for an inheritance:

with them that love him, and keep his commandments, to a thousand
generations;
see ( Exodus 20:6 ) which are not the causes or conditions of his covenant and mercy, nor of his keeping them, but descriptive of the persons that enjoy the benefit thereof.

Deuteronomy 7:9 In-Context

7 Not because ye were more in number than all the peoples, hath Jehovah been attached to you and chosen you, for ye are the fewest of all the peoples;

8 but because Jehovah loved you, and because he would keep the oath which he had sworn unto your fathers, hath Jehovah brought you out with a powerful hand, and redeemed you out of the house of bondage, from the hand of Pharaoh king of Egypt.

9 And thou shalt know that Jehovah thy God, he is God, the faithful God, who keepeth covenant and mercy to a thousand generations with them that love him and keep his commandments;

10 and repayeth them that hate him [each] to his face, to cause them to perish: he delayeth not with him that hateth him, he will repay him to his face.

11 And thou shalt keep the commandment, and the statutes, and the ordinances, which I command thee this day, to do them.