Targum for Genesis 27:41

And Esau kept hatred in his heart against Jakob his brother, on account of the order of blessing with which his father had blessed him. And Esau said in his heart, I will not do as Kain did, who slew Habel in the life (time) of his father, for which his father begat Sheth, but will wait till the time when the days of mourning for the death of my father come, and then will I kill Jakob my brother, and will be found the killer and the heir.