Text:

नाचिकेतमुपाख्यानं मृत्युप्रोक्तँ सनातनम् ।
उक्त्वा श्रुत्वा च मेधावी ब्रह्मलोके महीयते ॥ १६ ॥

nāciketamupākhyānaṃ mṛtyuproktam̐ sanātanam |
uktvā śrutvā ca medhāvī brahmaloke mahīyate || 16 ||

16. Hearing and repeating the old Nachiketa’s story told by Death, the intelligent man attains glory in the world of Brahman.

Shankara’s Commentary:

The sruti, for extolling the knowledge treated of, says: Nachiketam ] obtained by Nachiketas. Mrityuproktam ] told by Death. The story] contained in the three vallis. Old] of ancient date, being narrated in the Vedas. Repeating] to Brahmins. Hearing] from preceptors; world of Brahman ] world which is Brahman; attains glory] having become the atman, is fit to be worshipped.