Genesis 21:22-23

22Now it came about at that same time that Abimelech—with Phicol the commander of his army---said to Abraham, “God is with you in all that you do.

23So now, make a pledge to me here, by God, that you will not violate your word with me or with my descendants or with my offspring. As I have shown loyalty to you, show the same to me, and to the land in which you have lived as an outsider.”