Srimad Bhagavatam Canto 03, Chapter 12, Text 40

SB 3.12.40

sodasy-ukthau purva-vaktrat
 purisy-agnistutav atha
aptoryamatiratrau ca
 vajapeyam sagosavam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
All the different varieties of fire sacrifices [sodasi, uktha, purisi, agnistoma, aptoryama, atiratra, vajapeya and gosava] became manifested from the eastern mouth of Brahma.
Srimad Bhagavatam Canto 03, Chapter 12, Text 39
Srimad Bhagavatam Canto 03, Chapter 12, Text 41