Genesis 21:29

26 and Abimelech saith, `I have not known who hath done this thing, and even thou didst not declare to me, and I also, I have not heard save to-day.`

27 And Abraham taketh sheep and oxen, and giveth to Abimelech, and they make, both of them, a covenant;

28 and Abraham setteth seven Lambs of the flock by themselves.

29 And Abimelech saith unto Abraham, `What [are] they -- these seven lambs which thou hast set by themselves?`

30 And he saith, `For -- the seven lambs thou dost accept from my hand, so that it becometh a witness for me that I have digged this well;`

31 therefore hath he called that place `Beer-Sheba,` for there have both of them sworn.

32 And they make a covenant in Beer-Sheba, and Abimelech riseth -- Phichol also, head of his host -- and they turn back unto the land of the Philistines;