Chāndogya Upaniṣad 8.15

8.15.1

tad dhaitad brahmā prajāpataya uvāca prajāpatir manave manuḥ prajābhyaḥ \
ācāryakulād vedam adhītya yathāvidhānaṃ guroḥ (S ) kuṭumbe (S ) śucau deśe svādhyāyam adhīyāno dharmikān vidadhad ātmani sarvendriyāṇi saṃpratiṣṭhāpyāhiṃsan sarvabhūtāny anyatra tīrthebhyaḥ \
sa khalv evaṃ vartayan yāvad āyuṣaṃ brahmalokam abhisaṃpadyate \
na ca punar āvartate na ca punar āvartate \\815.1\

1. This did Brahmā tell to Prajāpati; Prajāpati, to Manu; Manu, to human beings (_prajā_).

He who according to rule has learned the Veda from the family of a teacher, in time left over from doing work for the teacher; he who, after having come back again, in a home of his own continues Veda-study in a clean place and produces [sons and pupils]; he who has concentrated all his senses upon the Soul (Ātman); he who is harmless (_ahiṃsant_) toward all things elsewhere than at holy places (_tīrtha_)—he, indeed, who lives thus throughout his length of life, reaches the Brahma-world and does not return hither again—yea, he does not return hither again!