Genesis 21:31

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

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.

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.

And Abraham planted a grove in Beersheba, and called there on the name of the LORD, the everlasting God.