John Gill

He shall go to the generation of his fathers,.... Be gathered to them at death; or "to the dwelling place of his fathers" (m); either the grave, or hell, or both; the habitation of his wicked ancestors: unless the words be rendered, as they are by some, though "he shall come to the age of his fathers" (n); live as long as they have done; yet he must die at last, and leave all behind, as they have done; they shall never see light; neither he nor his fathers; they shall never see light of the sun any more, nor return to the light of the living, but shall lie in the dark and silent grave until the resurrection; or rather, they shall never enjoy eternal light, glory, and happiness. The ultimate state of glory is sometimes expressed by "light"; Joh 8:12; this the people of God, such who are made light in the Lord, and are the children of the day, shall see; but wicked men shall not; they will be cast into outer darkness, where are weeping, wailing, and gnashing of teeth. (m) "ad habitationem", Gejerus. (n) "Usque ad aetatem", Junius & Tremellius, Piscator.