Adam Clarke on Proverbs 21:16

The man once enlightened, that wandereth out of the way of understanding, in which he had walked, shall remain - have a permanent residence - in the congregation of the dead; רפאים rephaim, the lost; either separate spirits in general, or rather the assembly of separate spirits, which had fallen from primitive rectitude; and shall not be restored to the Divine favor; particularly those sinners who were destroyed by the deluge. This passage intimates that those called rephaim are in a state of conscious existence. It is difficult to assign the true meaning of the word in several places where it occurs: but it seems to mean the state of separate spirits, i.e., of those separated from their bodies, and awaiting the judgment of the great day: but the congregation may also include the fallen angels. My old MS. Bible translates, The man that errith fro the wei of doctrine, in the felowschip of geantis schal wonnen.