He made a covenant with Abraham because of his faithfulness and not because he loved them than other people.
Note: The Lord always keeps his promises.
Deuteronomy 7:7-8 RV1885
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 peoples: but because the LORD loveth you, and because he would keep the oath which he sware unto your fathers, hath the LORD brought you out with a mighty hand, and redeemed you out of the house of bondage, from the hand of Pharaoh king of Egypt.