Kaṭhopaniṣad 1.17-18—The Thrice-Triple Fire

“One who, getting connection with the three, piles up the Nāciketa fire thrice, and undertakes the three kinds of work, crosses over death. Getting knowledge of that Omniscient One who is born of Brahmā (Virāṭ), and realising Him, he attains this peace fully. One who performs the Nāciketa sacrifice thrice after having known these three factors, and he who having known thus, accomplishes the Nāciketa sacrifice, casts off the snares of Death even earlier, and crossing over sorrow, rejoices in heaven.”