KAṬHA UPANISHAD · 1.1.17

त्रिणाचिकेतस्त्रिभिरेत्य सन्धिं
त्रिकर्मकृत्तरति जन्ममृत्यू ।
ब्रह्मजज्ञं देवमीड्यं विदित्वा
निचाय्येमाँ शान्तिमत्यन्तमेति ॥ १७॥

triṇāciketastribhiretya sandhiṃ
trikarmakṛttarati janmamṛtyū ।
brahmajajñaṃ devamīḍyaṃ viditvā
nicāyyemām̐ śāntimatyantameti ॥ 17॥

“Whoso lights the three fires of Nachiketas and comes to union with the Three and does the triple works, beyond birth and death he crosses; for he finds the God of our adoration, the Knower who is born from the Brahman, whom having beheld he attains to surpassing peace.

Sri Aurobindo · CWSA 18, pp. 104, 105