Genesis 30:36-38

King James Version

³⁶ And he set three days' journey betwixt himself and Jacob: and Jacob fed the rest of Laban's flocks.

³⁷ And Jacob took him rods of green poplar, and of the hazel and chesnut tree; and pilled white strakes in them, and made the white appear which was in the rods.

³⁸ And he set the rods which he had pilled before the flocks in the gutters in the watering troughs when the flocks came to drink, that they should conceive when they came to drink.