כִּ֚י יְהוָ֣ה אֱלֹהֶ֔יךָ אֵ֥שׁ אֹכְלָ֖ה ה֑וּא אֵ֖ל קַנָּֽא׃ (פ)
װאָרום ה׳ דײַן גאָט איז אַ פֿײַער װאָס פֿאַרצערט, אַ צערנדיקער גאָט.
Rashi
אל קנא A JEALOUS GOD — jealous to take vengeance, in O. F. emportment; glowing in his anger to exact punishment from those who worship idols (cf. Rashi on Numbers 25:11).
Chizkuni
אש אוכלה הוא, “He, (the Lord) is a devouring fire.” He is comparable to a devouring fire.
Ibn Ezra
a consuming fire i.e., like a consuming fire (even though the phrase lacks a kaf).