Genesis 21:22-24

22And it came to pass at that time, that Abimelech and Phicol the captain of his host spake unto Abraham, saying, God is with thee in all that thou doest:

23now therefore swear unto me here by God that thou wilt not deal falsely with me, nor with my son, nor with my son’s son: but according to the kindness that I have done unto thee, thou shalt do unto me, and to the land wherein thou hast sojourned.

24And Abraham said, I will swear.