שְׁ֭בֹר זְר֣וֹעַ רָשָׁ֑ע וָ֝רָ֗ע תִּֽדְרוֹשׁ־רִשְׁע֥וֹ בַל־תִּמְצָֽא׃
求你打斷惡人的膀臂；至於作惡的人，你若追究他的惡行，必再也找不到。
Rabbeinu Bahya
One may also explain the wording of this prayer in a different way. Yaakov prayed for what he needed immediately and for his needs during future generations. As far as his immediate needs were concerned, he needed to be saved from “my brother.” During future generations, throughout a good part of Jewish history, he or his descendants would need to be saved “from Esau.” Concerning such future times, David also formulated a prayer in Psalms 10,15 when he said: שבור זרוע רשע, “break the power (arm) of the wicked!”