Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 21

Sanskrit:

तत्रर्ग्वेदधर: पैल: सामगो जैमिनि: कवि: ।वैशम्पायन एवैको निष्णातो यजुषामुत ॥ २१ ॥

ITRANS:

tatrarg-veda-dharaḥ pailaḥsāmago jaiminiḥ kaviḥvaiśampāyana evaikoniṣṇāto yajuṣām uta

Translation:

After the Vedas were divided into four divisions, Paila Ṛṣi became the professor of the Ṛg Veda, Jaimini the professor of the Sāma Veda, and Vaiśampāyana alone became glorified by the Yajur Veda.

Purport:

The different Vedas were entrusted to different learned scholars for development in various ways.