Srimad Bhagavatam Canto 04, Chapter 01, Text 39

SB 4.1.39

krator api kriya bharya
valakhilyan asuyata
rsin sasti-sahasrani
jvalato brahma-tejasa
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Kratu’s wife, Kriya, gave birth to sixty thousand great sages, named the Valakhilyas. All these sages were greatly advanced in spiritual knowledge, and their bodies were illuminated by such knowledge.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Kriya was the sixth daughter of Kardama Muni, and she produced sixty thousand sages, who were known as the Valakhilyas because they all retired from family life as vanaprasthas.
Srimad Bhagavatam Canto 04, Chapter 01, Text 38
Srimad Bhagavatam Canto 04, Chapter 01, Text 40