Kaṭha Upaniṣad 1.17

1.17

triṇāciketas tribhir etya sandhiṃ trikarmakṛt tarati janmamṛtyū /
brahmajajñaṃ devam īḍyaṃ viditvā nicāyyemāṃ śāntim atyantam eti //

'He who has three times performed this Nâkiketa rite, and has been united with the three (father, mother, and teacher), and has performed the three duties (study, sacrifice, almsgiving) overcomes birth and death. When he has learnt and understood this fire, which knows (or makes us know) all that is born of Brahman, which is venerable and divine, then he obtains everlasting peace.'