They shall lie down alike in the dust - The emphasis here is on the word "alike" - יחד yachad. The idea is, that they should die "in a similar manner." There would be no such difference in the mode of their death as to determine anything about their character or to show that one was the friend of God, and that the other was not. The friends of Job had maintained, that that could be certainly known by the divine dealings with people, either in their life, or in their death. Job combats this opinion, and says, that there is no such marked distinction in their life, nor is there any certain indication of their character in their death. Prosperity often attends the wicked as well as the righteous, and the death of the righteous and the wicked resemble each other.
And the worms shall cover them - Cover them "both." They shall alike moulder back to dust. There is no distinction in the grave. There is no difference in the manner in which they moulder back to dust. No argument can be drawn respecting their character from the divine dealings toward them when in life - none from the manner of their death - none from the mode in which they moulder back to dust. On the reference to the "worm" here, see the notes at Job 14:11.

They shall lie down alike in the dust - Death levels all distinctions, and the grave makes all equal. There may be a difference in the grave itself; but the human corpse is the same in all. Splendid monuments enshrine corruption; but the sod must lie close and heavy upon the putrefying carcass, to prevent it from becoming the bane of the living.

They shall lie down alike in (o) the dust, and the worms shall cover them.
(o) As concerning their bodies: and this he speaks according to the common judgment.

They shall lie down alike in the dust,.... Such as have lived and died in great outward prosperity, or in more unhappy circumstances; these are levelled by death, and brought into the same state and condition; are laid on dusty beds, where there is no difference between them, their rest together is in the dust; here they dwell, and here they lie and sleep until they are awaked in the morning of the resurrection:
and the worms shall cover them; these are the companions alike unto them, and sweetly feed on the one as on the other; the earth is their bed, and worms are their covering; even such who used to lie on beds of down, and were covered with coverings of silk, have now the same bed and covering as those who used to lie on beds of straw, and scarce any thing to cover them; worms are spread under them, and are spread upon them; they are both their bed and their covering, Isaiah 14:11.

(Ecclesiastes 9:2).

Alike - All these worldly differences are ended by death, and they lie in the grave without any distinction. So that no man can tell who is good, and who is bad by events which befall them in this life. And if one wicked man die in a palace, and another in a dungeon, they will meet in the congregation of the dead and damned; and the worm that dieth not, and the fire that is not quenched will be the same to both: which makes those differences inconsiderable, and not worth perplexing ourselves about.