Genesis 30:32-39

30:32 Let me walk among all your flocks today and remove from them every speckled or spotted sheep, every dark-colored lamb, and the spotted or speckled goats. These animals will be my wages. 30:33 My integrity will testify for me later on. When you come to verify that I’ve taken only the wages we agreed on, if I have in my possession any goat that is not speckled or spotted or any sheep that is not dark-colored, it will be considered stolen.” 30:34 “Agreed!” said Laban, “It will be as you say.”

30:35 So that day Laban removed the male goats that were streaked or spotted, all the female goats that were speckled or spotted (all that had any white on them), and all the dark-colored lambs, and put them in the care of his sons. 30:36 Then he separated them from Jacob by a three-day journey, while Jacob was taking care of the rest of Laban’s flocks.

30:37 But Jacob took fresh-cut branches from poplar, almond, and plane trees. He made white streaks by peeling them, making the white inner wood in the branches visible. 30:38 Then he set up the peeled branches in all the watering troughs where the flocks came to drink. He set up the branches in front of the flocks when they were in heat and came to drink. 30:39 When the sheep mated in front of the branches, they gave birth to young that were streaked or speckled or spotted.