Genesis 21:27-29

Young's Literal Translation

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?'