Job 21:18

“They are as stubble before the wind, etc.] Or how oft “are they as stubble?” etc. or how oft does God do the above things, “so that they are”, or “become, as stubble before the wind” f810, and as chaff that the storm carrieth, or “steals away” f811? hastily, suddenly, at an unawares like a thief: wicked men are comparable to stubble and chaff; for the vanity of their minds, their emptiness of all good things; for their lightness, the levity and inconstancy of their hearts, their principles and practices; for their uselessness and unprofitableness to God and men, to themselves and their fellow creatures; for their being fit fuel for everlasting burnings, their end like these being to be…”

“Job alludes to a like sentiment of Bildad (Job 18:18), using his own previous words (Job 13:25).”

“They are as stubble before the wind - According to the interpretation proposed of the previous verse, this may be read as a question, “How often is it that the wicked are made like stubble? You say that God deals with people exactly according to their characters, and that the wicked are certainly subjected to calamities; but how often does this, in fact, occur? Is it a uniform law? Do they not, in fact, live in prosperity, and arrive at a good old age?” It is not uncommon in the Scriptures to compare the wicked with stubble, and to affirm that they shall be driven away, as the chaff is driven by the wind; see the notes at Isaiah 17:13. The storm carrieth away - Margin, “stealeth away.” This…”

“as stubble: Job 13:25; Exo 15:7; Psa 1:4, Psa 35:5, Psa 83:13; Isa 5:24, Isa 17:13, Isa 29:5, Isa 40:24; Isa 41:15, Isa 41:16; Jer 13:24; Hos 13:3; Nah 1:10; Mat 3:12 carrieth: Heb. stealeth Job 21:19”