Genesis 30:31-33

31And he said, What shall I give thee? And Jacob said, Thou shalt not give me aught: if thou wilt do this thing for me, I will again feed thy flock and keep it.

32I will pass through all thy flock today, removing from thence every speckled and spotted one, and every black one among the sheep, and the spotted and speckled among the goats: and of such shall be my hire.

33So shall my righteousness answer for me hereafter, when thou shalt come concerning my hire that is before thee: every one that is not speckled and spotted among the goats, and black among the sheep, that if found with me shall be counted stolen.