תַּהֲר֥וּ חֲשַׁ֖שׁ תֵּ֣לְדוּ קַ֑שׁ רוּחֲכֶ֕ם אֵ֖שׁ תֹּאכַלְכֶֽם׃
너희가 겨를 잉태하고 짚을 해산할 것이며 너희의 호흡은 불이 되어 너희를 삼킬 것이며
Rashi on Isaiah
chaff (חֲשַׁשׁ) a kind of chaff, something that is easily ignited.
Rashi on Isaiah
your breath is fire From your body shall emanate breath of fire and will consume the chaff and the stubble.