KAṬHA UPANISHAD · 1.3.16

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

nāciketamupākhyānaṃ mṛtyuproktam̐ sanātanam ।
uktvā śrutvā ca medhāvī brahmaloke mahīyate ॥ 16॥

The man of intelligence having spoken or heard the eternal story of Nachiketas wherein Death was the speaker, grows great in the world of the Brahman.