קבלה אויף בראשית 27:5

The verse therefore states,³⁵⁵Genesis 27:5 “Rivkah heard when Yitzchak spoke to his son Esav,” and she commanded Yaakov to prepare the delicacies and receive the blessing of Esav. Had she not done so, not a single Jew would escape the sword of Edom during exile. Contemplate this very well, for I have enlightened you of the secret of Yitzchak’s blessing and love for Esav.