נֹתֵ֥ן לַיָּעֵ֖ף כֹּ֑חַ וּלְאֵ֥ין אוֹנִ֖ים עָצְמָ֥ה יַרְבֶּֽה׃
He giveth power to the faint; And to him that hath no might He increaseth strength.
Rashi on Isaiah
Who gives the tired strength And who will eventually renew strength for your tiredness.
Ibn Ezra on Isaiah
He giveth power, etc. How can He be weary, if He gives power to the faint, and strengthens him that is without strength. עָצְמָה Strength. It is a noun similar in form to חָבְמָה wisdom.