Genesis 30:31-32

31Then he said, “What can I pay you?” Jacob said, “You don’t need to pay me anything. If you will do this one thing for me, I will shepherd your flock again and watch it:

32let me pass through your flock today, removing every colorfully spotted lamb from there and every dark-colored lamb among the sheep as well as the colorfully spotted among the goats—and that will be my salary.