Isaiah 38:18

“For the grave cannot praise thee, death can not celebrate thee, &c.] That is, they that are in the grave, and under the power of death, they cannot celebrate the praises of God with their bodily organs; their souls may praise him in heaven, but they in their bodies cannot till the resurrection morn, or as long as they are under the dominion of the grave; so the Targum, “they that are in the grave cannot confess before thee, and the dead cannot praise thee;” in like manner the Septuagint and Arabic versions: this shows the design of God in restoring him from his sickness, and the view he himself had in desiring life, which was to praise the Lord; and which end could not have been answered had…”

“death--that is, the dead; Hades and its inhabitants (Job 28:22; see on Isa 38:11). Plainly Hezekiah believed in a world of disembodied spirits; his language does not imply what skepticism has drawn from it, but simply that he regarded the disembodied state as one incapable of declaring the praises of God before men, for it is, as regards this world, an unseen land of stillness; "the living" alone can praise God on earth, in reference to which only he is speaking; Isa 57:1-2 shows that at this time the true view of the blessedness of the righteous dead was held, though not with the full clearness of the Gospel, which "has brought life and immortality to light" (Ti2 1:10). hope for thy truth--…”

“For the grave cannot praise thee - The Hebrew word here is sheol. It is put by metonymy here for those who are in the grave, that is, for the dead. The word ‘praise’ here refers evidently to the public and solemn celebration of the goodness of God. It is clear, I think, that Hezekiah had a belief in a future state, or that he expected to dwell with ‘the inhabitants of the land of silence’ Isaiah 38:11 when he died. But he did not regard that state as one adapted to the celebration of the public praises of God. It was a land of darkness; an abode of silence and stillness; a place where there was no temple, and no public praise such as he had been accustomed to. A similar sentiment is…”

“Praise - The dead are not capable of glorifying thy name among men upon earth. They cannot expect nor receive the accomplishment of thy promised goodness in the land of the living. Isaiah 38:20”

“the grave: Psa 6:5, Psa 30:9, Psa 88:11, Psa 115:17, Psa 115:18; Ecc 9:10 they that: Num 16:33; Pro 14:32; Mat 8:12, Mat 25:46; Luk 16:26-31 Isaiah 38:19”

“In strophe 4 he rejoices in the preservation of his life as the highest good, and promises to praise God for it as long as he lives. "For Hades does not praise Thee; death does not sing praises to Thee: They that sink into the grave do not hope for Thy truth. The living, the living, he praises Thee, as I do today; The father to the children makes known Thy truth. Jehovah is ready to give me salvation; Therefore will we play my stringed instruments all the days of my life In the house of Jehovah." We have here that comfortless idea of the future state, which is so common in the Psalms (vid., Psa 6:6; Psa 30:10; Psa 88:12-13, cf., Psa 115:17), and also in the book of Ecclesiastes ( Ecc 9:4-5,…”