Genesis 27:40-41

ECB(i) 40 and you live by your sword and serve your brother; and so be it, as you ramble on, that you break his yoke from your neck. 41 And Esav opposes Yaaqov because of the blessing wherewith his father blessed him: and Esav says in his heart, The days of mourning for my father approach; then I slaughter my brother Yaaqov.