Srimad Bhagavatam Canto 09, Chapter 15, Text 08

SB 9.15.8

sa rsih prarthitah patnya
 svasrva capatya-kamyaya
srapayitvobhayair mantrais
 carum snatum gato munih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Thereafter, Rcika Muni’s wife and mother-in-law, each desiring a son, requested the Muni to prepare an oblation. Thus Rcika Muni prepared one oblation for his wife with a brahmana mantra and another for his mother-in-law with a ksatriya mantra. Then he went out to bathe.
Srimad Bhagavatam Canto 09, Chapter 15, Text 07
Srimad Bhagavatam Canto 09, Chapter 15, Text 09