कठोपनिषद्
Katha Upanishad
The boy Nachiketa questions Death himself about what lies beyond dying — six vallis on the deathless self.
GRETIL e-text · CC BY-NC-SA 4.0 (Sanskrit e-text) English: F. Max Müller, SBE (1879/1884), public domain. English: F. Max Müller, SBE (1879/1884), public domain.