Rashi on Deuteronomy 29:19/רש"י על דברים כ״ט:י״ט

1יעשן אף ה׳ THE ANGER OF THE LORD SHALL SMOKE [AGAINST THAT MAN] — Through anger the body becomes heated and smoke, as it were, issues from the nostrils. And thus does it state, (Psalms 18:9) “Smoke rose up in his nostril”. Although this idea is not really applicable to God, Scripture makes the human ear hear the matter (i.e. it tells it to him) in the manner that it is accustomed and able to understand according to the ordinary course of the world (i.e. when speaking of God it uses language that properly is applicable only to human beings because this the only language we have at our command).

2וקנאתו — This is a term denoting wrath, emportment in old French; it means: retaining one’s hold on the 'garment of vengeance', and not forgoing one’s right to punish.