Genesis 30:40

30:40 Jacob removed these lambs, but he made the rest of the flock face the streaked and completely dark-colored animals in Laban’s flock. So he made separate flocks for himself and did not mix them with Laban’s flocks.

Genesis 42:16

42:16 One of you must go and get your brother, while the rest of you remain in prison. In this way your words may be tested to see if you are telling the truth. If not, then, as surely as Pharaoh lives, you are spies!”