He who knows the three Nâkiketa fires, and knowing the three, piles up the Nâkiketa sacrifice, he, having first, thrown off the chains of death, rejoices in the world of heaven, beyond the reach of grief.

In plain words: Yama says that whoever knows and performs the threefold Nachiketas fire ritual breaks free from death's grip. That person is happy in heaven, beyond the reach of grief.