Genesis 21:26

23 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.

24 And Abraham said, I will give you my oath.

25 But Abraham made a protest to Abimelech because of a water-hole which Abimelech's servants had taken by force.

26 But Abimelech said, I have no idea who has done this thing; you never gave me word of it, and I had no knowledge of it till this day.

27 And Abraham took sheep and oxen and gave them to Abimelech, and the two of them made an agreement together.

28 And Abraham put seven young lambs of the flock on one side by themselves.

29 Then Abimelech said, What are these seven lambs which you have put on one side?