And upon thy sword shalt thou depend, entering at every place: yet thou shalt be supple and credulous, and be in subjection to thy brother; but it will be that when his sons become evil, and fall from keeping the commandments of the law, thou shalt break his yoke of servitude from off thy neck.
Esau's Yoke Breaks When Jacob's Sons Abandon Torah
Targum Pseudo-Jonathan on Genesis 27:40