Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 45
Sanskrit:
पुत्रानध्यापयत्तांस्तु ब्रह्मर्षीन् ब्रह्मकोविदान् ।ते तु धर्मोपदेष्टार: स्वपुत्रेभ्य: समादिशन् ॥ ४५ ॥
ITRANS:
putrān adhyāpayat tāṁs tubrahmarṣīn brahma-kovidānte tu dharmopadeṣṭāraḥsva-putrebhyaḥ samādiśan
Translation:
Brahmā taught these Vedas to his sons, who were great sages among the brāhmaṇas and experts in the art of Vedic recitation. They in turn took the role of ācāryas and imparted the Vedas to their own sons.