Chandogya Upanishad 8.62

तद्धैतद्ब्रह्मा प्रजापतये उवाच प्रजापतिर्मनवे मनुः प्रजाभ्यः आचार्यकुलाद्वेदमधीत्य यथाविधानं गुरोः कर्मातिशेषेणाभिसमावृत्य कुटुम्बे शुचौ देशे स्वाध्यायमधीयानो धर्मिकान्विदधदात्मनि सर्वैन्द्रियाणि संप्रतिष्ठाप्याहिꣳसन्सर्व भूतान्यन्यत्र तीर्थेभ्यः स खल्वेवं वर्तयन्यावदायुषं ब्रह्मलोकमभिसंपद्यते न च पुनरावर्तते न च पुनरावर्तते ॥ १ ॥

8.15.1 — taddhaitadbrahma prajapataye uvacha prajapatirmanave manuh prajabhyah aacharyakuladvedamadhitya yathavidhanam guroh karmatisheshenabhisamavritya kutumbe shuchau deshe svadhyayamadhiyano dharmikanvidadhadatmani sarvaindriyani sampratishthapyahimsansarva bhutanyanyatra tirthebhyah sa khalvevam vartayanyavadayusham brahmalokamabhisampadyate na cha punaravartate na cha punaravartate || 1 ||

Brahmâ (Hiranyagarbha or Paramesvara) told this to Pragâpati (Kasyapa), Pra'gâpati to Manu (his son), Manu to mankind. He who has learnt the Veda from a family of teachers, according to the sacred rule, in the leisure time left from the duties to be performed for the Guru, who, after receiving his discharge, has settled in his own house, keeping up the memory of what he has learnt by repeating it regularly in some sacred spot, who has begotten virtuous sons, and concentrated all his senses on the Self, never giving pain to any creature, except at the tîrthas (sacrifices, &c), he who behaves thus all his life, reaches the world of Brahman, and does not return, yea, he does not return.

यह ब्रह्मा ने प्रजापति को कहा, प्रजापति ने मनु को, मनु ने प्रजा को। आचार्य-कुल से विधिपूर्वक वेद का अध्ययन करके, गुरु के लिये किये गये कार्य के शेष समय में, कुटुम्ब में, शुद्ध स्थान में, स्वाध्याय करते हुए, धार्मिक सन्तानों को आत्मा में प्रतिष्ठित करके, समस्त इन्द्रियों को संयम में रखकर, तीर्थों (यज्ञादि) को छोड़कर किसी भी प्राणी की हिंसा न करते हुए — जो इस प्रकार जीवन-भर आचरण करता है — वह ब्रह्म-लोक को प्राप्त करता है, और पुनरावर्तन नहीं करता, पुनरावर्तन नहीं करता।