God layeth up his iniquity for his children. Job supposes his opponents to make this answer to his arguments. "God," they may say, "punishes the wicked man in his children" (comp. Exodus 20:5). Job does not deny that he may do so, but suggests a better course in the next sentence.
He rewardeth him; rather, let him recompense it on himself—let him make the wicked man himself suffer, and then he shall know it. He shall perceive and know that he is receiving the due reward of his wickedness.