Bereshit 27:41

יקרבו ימי אבל אבי THE DAYS OF MOURNING FOR MY FATHER APPROACH — Explain it according to the evident meaning of the words — (I will wait to kill him until my father is dead), that I may not cause grief to my father. There are Midrashic explanations of various kinds.

וַיִּשְׂטֹ֤ם עֵשָׂו֙ אֶֽת־יַעֲקֹ֔ב עַ֨ל־הַבְּרָכָ֔ה אֲשֶׁ֥ר בֵּרְכ֖וֹ אָבִ֑יו וַיֹּ֨אמֶר עֵשָׂ֜ו בְּלִבּ֗וֹ יִקְרְבוּ֙ יְמֵי֙ אֵ֣בֶל אָבִ֔י וְאַֽהַרְגָ֖ה אֶת־יַעֲקֹ֥ב אָחִֽי׃

And ῾Esav hated Ya῾aqov because of the blessing with which his father blessed him: and ῾Esav said in his heart, When the days of mourning for my father are at hand; then will I slay my brother Ya῾aqov.