Genesis 21:30

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

²⁹  And Abimelech said unto Abraham, What mean these seven ewe lambs which thou hast set by themselves?

³⁰  And he said, For these seven ewe lambs shalt thou take of my hand, that they may be a witness unto me, that I have digged this well.

³¹  Wherefore he called that place Beersheba; because there they sware both of them.

³²  Thus they made a covenant at Beersheba: then Abimelech rose up, and Phichol the chief captain of his host, and they returned into the land of the Philistines.