Genesis 30:31-32

31So he said, “What shall I give you?” And Jacob said, “You shall not give me anything. If you will do this one thing for me, I will again pasture and keep your flock:

32let me pass through your entire flock today, removing from there every 1speckled or spotted sheep and every black sheep among the lambs, and the spotted or speckled among the goats; and those shall be my wages.