Genesis 30:40

והכשבים הפריד יעקב AND JACOB PARTED THE LAMBS — Those sheep that were thus born spotted on the ankles and speckled he separated and set apart by themselves, thus forming them into a separate flock. He led that spotted flock in front of ordinary sheep so that the faces of the sheep that followed behind them were gazing at them. This is what Scripture means in saying, “He set the faces of the flocks towards the spotted” — that the faces of the sheep were directed towards the spotted animals and towards all that were brownish which he found amongst Laban’s sheep (i. e., amongst the sickly sheep which Laban had left him; cf. Genesis 5:36). וישת לו עדרים means he formed them into a separate flock as I have already explained.

וְהַכְּשָׂבִים֮ הִפְרִ֣יד יַעֲקֹב֒ וַ֠יִּתֵּ֠ן פְּנֵ֨י הַצֹּ֧אן אֶל־עָקֹ֛ד וְכׇל־ח֖וּם בְּצֹ֣אן לָבָ֑ן וַיָּֽשֶׁת־ל֤וֹ עֲדָרִים֙ לְבַדּ֔וֹ וְלֹ֥א שָׁתָ֖ם עַל־צֹ֥אן לָבָֽן׃

And Ya῾aqov separated the lambs, and set the faces of the flocks toward the streaked and all the brown in the flock of Lavan; and he put his own flocks by themselves, and put them not to Lavan’s cattle.