Rashi on Genesis 27:41/רש"י על בראשית כ״ז:מ״א

1יקרבו 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.