הִנֵּ֨ה הָי֤וּ כְקַשׁ֙ אֵ֣שׁ שְׂרָפָ֔תַם לֹֽא־יַצִּ֥ילוּ אֶת־נַפְשָׁ֖ם מִיַּ֣ד לֶֽהָבָ֑ה אֵין־גַּחֶ֣לֶת לַחְמָ֔ם א֖וּר לָשֶׁ֥בֶת נֶגְדּֽוֹ׃
Behold, they shall be as stubble; The fire shall burn them; They shall not deliver themselves From the power of the flame; It shall not be a coal to warm at, Nor a fire to sit before.
Ibn Ezra on Isaiah
Fire. The host of the enemy. Comp., There is a fire gone out of Heshbon (Num. 21:28).
Rashi on Isaiah
there is no coal by which to warm oneself They have no remnant, like stubble, the fire of which does not leave over coals by whose fire one can warm himself.