Adam Clarke on Job 20:28

The increase of his house shall depart, and his goods shall flow away in the day of his wrath - A farther allusion to the punishment of the rebellious company of Korah, who not only perished themselves, but their houses also, and their goods. Num 16:32. These examples were all in point, on the ground assumed by Zophar; and such well-attested facts would not be passed over by him, had he known the record of them; and that he did know it, alludes to it, and quotes the very circumstances, is more than probable.