כִּ֣י ׀ אֶת־עֹ֣ל סֻבֳּל֗וֹ וְאֵת֙ מַטֵּ֣ה שִׁכְמ֔וֹ שֵׁ֖בֶט הַנֹּגֵ֣שׂ בּ֑וֹ הַחִתֹּ֖תָ כְּי֥וֹם מִדְיָֽן׃
For the yoke of his burden, and the staff of his shoulder, the rod of his oppressor, Thou hast broken as in the day of Midian.
Read kabbalistic (mystical) interpretation of Isaiah 9:3: and classical mystical sources.