Commentaire sur La Genèse 30:36

הנותרות [THE FLOCK OF LABAN] THAT WAS LEFT — The defective animals amongst them, the sickly and the barren, which were nothing but the leavings — these he (Laban) handed over to him (Genesis Rabbah 73:9).

ובין יעקב, Lavan’s flocks which Yaakov tended were 3 days distant from the spotted and speckled ones which Lavan had first removed from the original flocks.

וישם, Lavan instructed his sons to make the spotted and speckled sheep in his flocks graze 3 days away from the animals Yaakov was tending. Yaakov let the remainder of the flock graze in the areas he had been used to. Lavan was so concerned that some of the striped and spotted animals under his sons’ care might wander back to the meadows in which they had grazed previously, and become mixed with the animals Yaakov was now tending. Yaakov might then claim that these animals were his.