Though his sons are many, they are destined for the sword; and his offspring will never have enough food.
Job's friends had seen a great deal of the misery and destruction that attend wicked people, especially oppressors; and Job, while the heat of disputation lasted, had said as much, and with as much assurance, of their prosperity; but now that the heat of the battle was nearly over he was willing to own how far he agreed with them, and where the difference between his opinion and theirs lay.
Commenting on Job 27:11-23
Those that remain of him,.... Of the wicked man after his death; or such that remain, and have escaped the sword and famine: shall be buried in death: the pestilence, emphatically called death by the Hebrews, as by us the mortality, see Rev 6:8.
His family only increases to perish by sword or famine (Jer 18:21; Job 5:20, the converse).