Genesis 27:41-42

41And Esau hated Jacob because of the blessing with which 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. 42And these words of Esau her elder son were told to Rebekah: and she sent and called Jacob her younger son, and said to him, Behold, thy brother Esau, as concerning thee, doth comfort himself, purposing to kill thee.