Genesis 21:22-23

A Treaty with Abimelech

22At that time aAbimelech and Phicol the commander of his army said to Abraham, bGod is with you in all that you do. 23Now therefore swear to me here by God that you will not deal falsely with me or with my descendants or with my posterity, but cas I have dealt kindly with you, so you will deal with me and with the land where you have sojourned.”
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