Genesis

²⁷And Abraham took sheep and oxen, and gave them unto Abimelech; and they two made a covenant. ²⁸And Abraham set seven ewe lambs of the flock by themselves. ²⁹And Abimelech said unto Abraham, What mean these seven ewe lambs which thou hast set by themselves? ³⁰And he said, These seven ewe lambs shalt thou take of my hand, that it may be a witness unto me, that I have digged this well. ³¹Wherefore he called that place Beer-sheba; because there they sware both of them. ³²So they made a covenant at Beer-sheba: and Abimelech rose up, and Phicol the captain of his host, and they returned into the land of the Philistines. ³³And Abraham planted a tamarisk tree in Beer-sheba, and called there on the name of the LORD, the Everlasting God.