Genesis 30:41-43

Young's Literal Translation

⁴¹ And it hath come to pass whenever the strong ones of the flock conceive, that Jacob set the rods before the eyes of the flock in the gutters, to cause them to conceive by the rods,

⁴² and when the flock is feeble, he doth not set [them]; and the feeble ones have been Laban's, and the strong ones Jacob's.

⁴³ And the man increaseth very exceedingly, and hath many flocks, and maid-servants, and men-servants, and camels, and asses.