כִּ֣י כֹ֥ה יִהְיֶ֛ה בְּקֶ֥רֶב הָאָ֖רֶץ בְּת֣וֹךְ הָֽעַמִּ֑ים כְּנֹ֣קֶף זַ֔יִת כְּעוֹלֵלֹ֖ת אִם־כָּלָ֥ה בָצִֽיר׃
Rashi on Isaiah
For so shall Israel remain in the midst of the peoples, one in a city and two in a family.
Ibn Ezra on Isaiah
בנקף As the shaking. נקף is similar in meaning to ונקף and he shall cut down (10:34).
Rashi on Isaiah
like the cutting of the olive tree that leaves over berries at the tip of the uppermost bough.