Genesis 21
22 Ref Now at that time, Abimelech and Phicol, the captain of his army, said to Abraham, I see that God is with you in all you do.
23 Ref Now, then, give me your oath, in the name of God, that you will not be false to me or to my sons after me, but that as I have been good to you, so you will be to me and to this land where you have been living.