Srimad Bhagavatam Canto 04, Chapter 14, Text 46

SB 4.14.46

tasya vamsyas tu naisada
giri-kanana-gocarah
yenaharaj jayamano
vena-kalmasam ulbanam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
After his [Nisada’s] birth, he immediately took charge of all the resultant actions of King Vena’s sinful activities. As such, this Naisada class are always engaged in sinful activities like stealing, plundering and hunting. Consequently they are only allowed to live in the hills and forests.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The Naisadas are not allowed to live in cities and towns because they are sinful by nature. As such, their bodies are very ugly, and their occupations are also sinful. We should, however, know that even these sinful men (who are sometimes called Kiratas) can be delivered from their sinful condition to the topmost Vaisnava platform by the mercy of a pure devotee. Engagement in the transcendental loving devotional service of the Lord can make anyone, however sinful he may be, fit to return home, back to Godhead. One has only to become free from all contamination by the process of devotional service. In this way everyone can become fit to return home, back to Godhead. This is confirmed by the Lord Himself in Bhagavad-gita (9.32):
 
mam hi partha vyapasritya
ye ’pi syuh papa-yonayah
striyo vaisyas tatha sudras
te ’pi yanti param gatim
 
“O son of Prtha, those who take shelter of Me, though they be of lower birth — women, vaisyas [merchants] as well as sudras [workers] — can approach the supreme destination.”
 
Thus end the Bhaktivedanta purports of the Fourth Canto, Fourteenth Chapter, of the Srimad-Bhagavatam, entitled “The Story of King Vena.”
Srimad Bhagavatam Canto 04, Chapter 14, Text 44
Srimad Bhagavatam Canto 04, Chapter 14, Text 42