Genesis 21:25-30

25Then Abraham rebuked Abimelech because of a well of water which Abimelech’s servants had seized.

26And Abimelech said, “I do not know who has done this thing; you did not tell me, nor had I heard of it until today.”

27So Abraham took sheep and oxen and gave them to Abimelech, and the two of them made a covenant.

28And Abraham set seven ewe lambs of the flock by themselves.

29Then Abimelech asked Abraham, “What is the meaning of these seven ewe lambs which you have set by themselves?”

30And he said, “You will take these seven ewe lambs from my hand, that they may be my witness that I have dug this well.”