The boy Naciketas, given away to Death by his angry father, waits three nights at Death's door, and as his third boon asks what remains when a person dies. Yama's answer is the whole Upaniṣad: the Self, the chariot, the two paths.
Kṛṣṇa Yajurveda
The teaching of Yama to Naciketas · 120 Mantras
Go to adhyāya
Adhyāya 1Naciketas and the Three BoonsAdhyāya 2The Better and the PleasantAdhyāya 3The Chariot, and the Way BeyondAdhyāya 4The Self Concealed and RevealedAdhyāya 5The City of Eleven GatesAdhyāya 6The Inverted Tree, and the Untying of the Heart's Knot