C. F. Keil and Franz Delitzsch on Isaiah 14:10

Isa 14:10

And how do they greet this lofty new-comer? “They all rise up and say to thee, Art thou also made weak like us? art thou become like us?” This is all that the shades say; what follows does not belong to them. The pual chullâh (only used here), “to be made sickly, or powerless,” signifies to be transposed into the condition of the latter, viz., the Repahim (a word which also occurs in the Phoenician inscriptions, from רפא = רפה, to be relaxed or weary), since the life of the shades is only a shadow of life (cf., εἴδωλα ἄκικυς, and possibly also καμόντες in Homer, when used in the sense of those who are dying, exhausted and prostrate with weakness). And in Hades we could not expect anything more than this expression of extreme amazement. For why should they receive their new comrade with contempt or scorn? From Isa 14:11 onwards, the singers of the mashal take up the song again.