God layeth up his iniquity for his children: he rewardeth him, and he shall know it.

Wesley's Notes

21:19 Layeth up - In his treasures, Rom 2:5. Iniquity - The punishment of his iniquity; he will punish him both in his person and in his posterity.

King James Translators' Notes

his iniquity: that is, the punishment of his iniquity

Scofield Reference Notes

Margin iniquity

i.e. the punishment of his iniquity.

Jamieson-Fausset-Brown Bible Commentary

19. Equally questionable is the friends' assertion that if the godless himself is not punished, the children are (Job 18:19; 20:10); and that God rewardeth him here for his iniquity, and that he shall know it to his cost. So "know" (Ho 9:7).

Matthew Henry's Concise Commentary

21:17-26 Job had described the prosperity of wicked people; in these verses he opposes this to what his friends had maintained about their certain ruin in this life. He reconciles this to the holiness and justice of God. Even while they prosper thus, they are light and worthless, of no account with God, or with wise men. In the height of their pomp and power, there is but a step between them and ruin. Job refers the difference Providence makes between one wicked man and another, into the wisdom of God. He is Judge of all the earth, and he will do right. So vast is the disproportion between time and eternity, that if hell be the lot of every sinner at last, it makes little difference if one goes singing thither, and another sighing. If one wicked man die in a palace, and another in a dungeon, the worm that dies not, and the fire that is not quenched, will be the same to them. Thus differences in this world are not worth perplexing ourselves about.