Genesis 21:27-30

27Abraham took sheep and oxen and gave them to Abimelech, and 1the two of them made a covenant.

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

29Abimelech said to Abraham, “What do these seven ewe lambs mean, which you have set by themselves?”

30He said, “You shall take these seven ewe lambs from my hand so that it may be a 2witness to me, that I dug this well.”