מֵחֲמַ֛ס אָחִ֥יךָ יַעֲקֹ֖ב תְּכַסְּךָ֣ בוּשָׁ֑ה וְנִכְרַ֖תָּ לְעוֹלָֽם׃
For the violence done to thy brother Jacob shame shall cover thee, And thou shalt be cut off for ever.
Rashi on Obadiah
Because of the violence of your brother Jacob—Because of the violence you inflicted upon Jacob.