Esau hated Jacob; and this hatred was hereditary, extending to their posterity also. See Ezekiel 35:5 Amos 1:11 Obadiah 1:10. Esau said in his heart, within himself; although he could not contain it there, but declared his intentions to some of his confidants, by which means it came to Rebekah's ear.
Related Commentaries of Genesis 27:41
Genesis 27:41
41 And Esau hated Jacob because of the blessing wherewith his father blessed him: and Esau said in his heart, The days of mourning for my father are at hand; then will I slay my brother Jacob.