Genesis 21:22-32

22At that time Abimelech, accompanied by Phicol, the commander of his army, said to Abraham, “God is with you in everything you do.

23Now, swear an oath to me here in front of God that you will never cheat me, my children, or my descendants. Show me and the land where you’ve been living the same kindness that I have shown you.”

24Abraham said, “I so swear.”

25Then Abraham complained to Abimelech about a well which Abimelech’s servants had seized.

26Abimelech replied, “I don’t know who did this. You didn’t tell me, and I didn’t hear about it until today.”

27Abraham took some sheep and cattle and gave them to Abimelech, and the two of them made an agreement.

28Then Abraham set apart seven female lambs from the flock.

29Abimelech asked him, “What is the meaning of these seven female lambs you have set apart?”

30Abraham answered, “Accept these lambs from me so that they may be proof  that I dug this well.”

31This is why that place is called Beersheba, because both of them swore an oath there.

32After they made the treaty at Beersheba, Abimelech and Phicol, the commander of his army, left and went back to the land of the Philistines.