Adam Clarke on Job 21:33

The clods of the valley shall be sweet unto him - Perhaps there is an allusion here to the Asiatic mode of interment for princes, saints, and nobles: a well-watered valley was chosen for the tomb, where a perpetual spring might be secured. This was intended to be the emblem of a resurrection, or of a future life; and to conceal as much as possible the disgrace of the rotting carcass.

Every man shall draw after him - There seem to be two allusions intended here:

1. To death, the common lot of all. Millions have gone before him to the tomb; and כל אדם col adam, all men, shall follow him: all past generations have died, all succeeding generations shall die also.

2. To pompous funeral processions; multitudes preceding, and multitudes following, the corpse.