Srimad Bhagavatam Canto 04, Chapter 13, Text 02

SB 4.13.2

vidura uvaca
ke te pracetaso nama
kasyapatyani suvrata
kasyanvavaye prakhyatah
kutra va satram asata
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Vidura inquired from Maitreya: O greatly advanced devotee, who were the Pracetas? To which family did they belong? Whose sons were they, and where did they perform the great sacrifices?
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The great Narada’s singing, in the previous chapter, of three verses in the sacrificial arena of the Pracetas gave another impetus to Vidura to ask further questions.
Srimad Bhagavatam Canto 04, Chapter 13, Text 01
Srimad Bhagavatam Canto 04, Chapter 13, Text 03