Genesis 21:22-24

At that time Abimelech and Phicol the commander of his army said to Abraham, “God is with you in all that you do. Now therefore swear to me here by God that you will not deal falsely with me or with my descendants or with my posterity, but as I have dealt kindly with you, so you will deal with me and with the land where you have sojourned.” And Abraham said, “I will swear.”