Упанишады

Yama then told him that fire-sacrifice, the beginning of all the worlds; what bricks, how many and how laid for the altar. Nachiketas repeated all as it was told to him. Then Death, being pleased with him, again said: XVI The great-soured Yama, being well pleased, said to him (Nachiketas): I give thee now another boon. This fire (sacrifice) shall be named after thee. Take also this garland of many colours. XVII He who performs this Nachiketa fire-sacrifice three times, being united with the three (mother, father and teacher), and who fulfills the three-fold duty (study of the Vedas, sacrifice and alms-giving) crosses over birth and death. Knowing this worshipful shining fire, born of Brahman, and realizing Him, he attains eternal peace. XVIII He who knows the three-fold Nachiketa fire and performs the Nachiketa fire-sacrifice with three-fold knowledge, having cast off the fetters of death and being beyond grief, he rejoices in the realm of heaven. XIX O Nachiketas, this is thy fire that leads to heaven, which thou hast chosen as thy second boon. People will call this fire after thy name. Ask the third boon, Nachiketas.