Genesis 21:22-24

At that time, King Abimelech and Phicol, his army commander, came to Abraham and said, “It is obvious that God is with you and blesses everything you do. Now swear to me here before God that you will not deceive me, my children, or my descendants, but as I have shown you loyal friendship, so you will treat me—and the land in which you live as a foreigner—with loyal friendship.” “I give you my oath,” Abraham answered.