Job 21:19

“God layeth up his iniquity for his children, etc.] This is a prevention of an objection which Job foresaw his friends would make, and therefore takes it up and answers to it; you will say, that, be it so, that the wicked are for the most part prosperous, and their prosperity continues; God does not punish them now for their sins in their own persons, yet he will punish them in their children, for whom he reserves the punishment of their iniquity: this way go many of the Jewish commentators f812, in which they are followed by many Christian interpreters f813; and, as it seems, very rightly; now this Job grants, that so it is, God takes notice of the iniquities of men, and lays them up in his…”

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

“God layeth up his iniquity for his children - Margin, that is, “the punishment of iniquity.” This is a reference evidently to the opinion which “they” had maintained. It may be rendered, “You say that God layeth up iniquity,” etc. They had affirmed that not only did God, as a great law, punish the wicked in this life, but that the consequences of their sins passed over to their posterity; or, if “they” were not punished, yet the calamity would certainly come on their descendants; see Job 18:19-20; Job 20:10, Job 20:28. This is the objection which Job now adverts to. The statement of the objection, it seems to me, continues to Job 21:22, where Job says, that no one can teach God knowledge, or…”

“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. Job 21:20”

“21:19 you say: Job was quoting and rebutting his friends’ arguments. • God will punish their children: These were the words of Eliphaz (5:4) and Zophar (20:10), but Job thought God should punish the ones who sin (see Ezek 18:19-20).”

“layeth: Job 22:24; Deu 32:34; Mat 6:19, Mat 6:20; Rom 2:5 iniquity: that is, the punishment of his iniquity, Gen 4:7; Isa 53:4-6; Co2 5:21 for his: Exo 20:5; Psa. 109:9-31; Isa 14:21; Eze 18:14, Eze 18:19, Eze 18:20; Mat 23:31-35 he rewardeth: Deu 32:41; Sa2 3:39; Psa 54:5; Mat 16:27; Ti2 4:14; Rev 18:6 he shall: Mal 3:18 Job 21:20”