תַּהֲר֥וּ חֲשַׁ֖שׁ תֵּ֣לְדוּ קַ֑שׁ רוּחֲכֶ֕ם אֵ֖שׁ תֹּאכַלְכֶֽם׃
Concepite la pula, produrrete una barba; Il tuo respiro è un fuoco che ti divorerà.
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.