Kaṭha Upaniṣad 32

32

pra te bravīmi tad u me nibodha svargyam agniṃ naciketaḥ prajānan /
anantalokāptim atho pratiṣṭhāṃ viddhi tvam etaṃ nihitaṃ guhāyām ///1,1.14 //

14. (Death says) I will tell thee well; attend to me, Oh Nachiketas, I know the fire leading to heaven; know the fire which leads to heaven and also the support of the universe and which is seated in the cavity.