After the Vedas were divided into four divisions, Paila Rsi became the professor of the Rg Veda, Jaimini the professor of the Sama Veda, and Vaisampayana alone became glorified by the Yajur Veda

Expressions researched:
"After the Vedas were divided into four divisions, Paila Rsi became the professor of the Rg Veda, Jaimini the professor of the Sama Veda, and Vaisampayana alone became glorified by the Yajur Veda"

SB Canto 1

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.

SB 1.4.21, Translation and Purport:

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.

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