Genesis 21:22-31

And it came to pass at that time, that Abimelech and Phicol the captain of his host spake unto Abraham, saying, God is with thee in all that thou doest: now therefore swear unto me here by God that thou wilt not deal falsely with me, nor with my son, nor with my son’s son: but according to the kindness that I have done unto thee, thou shalt do unto me, and to the land wherein thou hast sojourned. And Abraham said, I will swear. And Abraham reproved Abimelech because of the well of water, which Abimelech’s servants had violently taken away. And Abimelech said, I know not who hath done this thing: neither didst thou tell me, neither yet heard I of it, but to-day. And Abraham took sheep and oxen, and gave them unto Abimelech; and they two made a covenant. And Abraham set seven ewe lambs of the flock by themselves. And Abimelech said unto Abraham, What mean these seven ewe lambs which thou hast set by themselves? And 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. Wherefore he called that place Beer-sheba; because there they sware both of them.