Rashi on Deuteronomy 32:24/רש"י על דברים ל״ב:כ״ד

1מזי רעב — Onkelos rendered this by “swollen by famine”. I have, however, no convincing proof for this meaning. In the name of R. Moses the Preacher of Toulouse have heard that it is the same as שעירי רעב, “hairy through hunger”, for an emaciated person grows much hair on his flesh.

2In the Aramaic language the term for hair is מזיא, as e.g. in the phrase (Megillah 18a) “who was busying himself with his hair (במזיא)".

3ולחמי רשף This means, the demons fight with them (לחם means “to battle”), — as it states, (Job. 5:7) “As the בני רשף fly upwards”, and they are the demons (Berachot 5a).

4וקטב מרירי means and the destruction caused by a demon whose name is מרירי. The word קטב denotes “cutting off”, “destruction”, as in (Hosea 13:14) “I will be thy destruction (קטבך) O grave”.

5ושן בהמת [I WILL SEND FORTH] THE TEETH OF CATTLE [UPON THEM] (i.e., even the teeth of cattle, not only of wild beasts) — It indeed happened once that lambs bit people and caused their death (Sifrei Devarim 321:8; cf. Rashi on Leviticus 26:22).

6חמת זחלי עפר THE FURY OF THOSE CRAWLING IN THE DUST — i.e. the poison of serpents that crawl on their bellies upon the ground as the water trickles (זחל) upon the ground. The root זחל properly denotes the passage of water upon the dust, and it is similarly used as here of the passage of anything that proceeds in a shuffling manner upon the ground.