Genesis 21:22-23

22At that time Abimelech, accompanied by Phicol the commander of his army, said to Abraham, “God is with you in everything you do.

23Swear to me by God here and now, that you will not break an agreement with me or with my children and descendants. As I have been loyal to you, so you will be loyal to me and to the country where you are a resident alien.”