Genesis 30:40

And Jacob did separate the lambs, and set the faces of the flocks toward the ringstraked, and all the brown in the flock of Laban; and he put his own flocks by themselves, and put them not unto Laban's cattle.

Ver. 40. And set the faces of the flocks, &c.] That by the sight of the speckled cattle they might bring forth lambs like them that were in their eye.