Srimad Bhagavatam Canto 07, Chapter 10, Text 19

SB 7.10.19

yatra yatra ca mad-bhaktah
 prasantah sama-darsinah
sadhavah samudacaras
 te puyante ’pi kikatah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Whenever and wherever there are peaceful, equipoised devotees who are well-behaved and decorated with all good qualities, that place and the dynasties there, even if condemned, are purified.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Wherever exalted devotees stay, not only they and their dynasties but the entire country is purified.
Srimad Bhagavatam Canto 07, Chapter 10, Text 18
Srimad Bhagavatam Canto 07, Chapter 10, Text 20