Genesis 21:25

Now 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.

And Abraham said, I will swear.

And Abimelech said, I wot not who hath done this thing; neither didst thou tell me, neither yet heard I of it, but to day.

And Abraham took sheep and oxen, and gave them unto Abimelech; and both of them made a covenant.