Commentary for Job 20:26

for what awaits him For the hidden things that lie in store for him.

fire that was not blown The fire of Gehinnom.

harm shall befall the survivor in his tent Harm will come upon the survivor who will remain in his tent. The entire portion deals with the people of Sodom. “Harm shall befall the survivor in his tent” means that even Lot who escaped from them—harm befell his tent, i.e., his wife, who became a pillar of salt. I found this in the midrash of Rabbi Tanchuma (Buber, Vayera 8).