Комментарий о цитате к Тегилим 47:1

.ובני קרח לא מתו , “and Korach’s sons did not die.” Our sages in Megillah 14 explain these words to mean that there was a special place reserved for them in Gehinom where they remained. The site where the swallowing occurred and where judgment of these individuals occurs is known as Gehinom. Alternatively, the sages meant the real purgatory the entrance to which is close to the point where Korach and company were swallowed. (According to Eyruvin 19 there are a total of three such portals to purgatory). We find that sons (or descendants) of Korach sang hymns in the Holy Temple as we know from Psalms 47,1 and 48,1 and others.