בפיו. כְּתַרְגּוּמוֹ בְּפִיו שֶׁל יִצְחָק. וּמִדְרָשׁוֹ בְּפִיו שֶׁל עֵשָׂו, שֶׁהָיָה צָד אוֹתוֹ וּמְרַמֵּהוּ בִדְבָרָיו:
בפיו [THERE WAS HUNTING] IN HIS MOUTH — Understand this as the Targum renders it: in Isaac’s mouth (i. e. Isaac ate the venison he brought home). But its Midrashic explanation is: there was hunting in Esau’s mouth, meaning that he used to entrap and deceive him by his words (Genesis Rabbah 63:10).