Psalms 49:19

He shall go to the generation of his fathers - To be gathered to one’s own people, or to his fathers, is a common expression in the Old Testament in speaking of death. See Genesis 25:8, Genesis 25:17; Genesis 35:29; Genesis 49:29, Genesis 49:33, Numbers 20:24, Numbers 20:26; Numbers 27:13; Numbers 31:2; Deuteronomy 32:50; Judges 2:10. It means that they were united again with those who had gone before them, in the regions of the dead. Death had indeed separated them, but by death they were again united.

They shall never see light - He and the “generation” to which he has gone to be united, would no more see the light of this world; no more walk among the living: Job 33:30. Compare the notes at Isaiah 38:11; notes at Psalms 27:13. The meaning is, that the rich sinner will die as others have done before him, leaving all his earthly possessions, and will no more be permitted to revisit the world where his forsaken possessions are, and will not even be permitted to “look” on what before had been to him such a source of self-confidence, self-gratulation, and pride.