Srimad Bhagavatam Canto 03, Chapter 12, Text 36

SB 3.12.36

vidura uvaca
sa vai visva-srjam iso
 vedadin mukhato ’srjat
yad yad yenasrjad devas
 tan me bruhi tapo-dhana
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Vidura said: O great sage whose only wealth is penance, kindly explain to me how and with whose help Brahma established the Vedic knowledge which emanated from his mouth.
Srimad Bhagavatam Canto 03, Chapter 12, Text 35
Srimad Bhagavatam Canto 03, Chapter 12, Text 37