Srimad Bhagavatam Canto 10, Chapter 74, Text 40

SB 10.74.40

nindam bhagavatah srnvams
 tat-parasya janasya va
tato napaiti yah so ’pi
 yaty adhah sukrtac cyutah
 
Translation: 
 
Anyone who fails to immediately leave the place where he hears criticism of the Supreme Lord or His faithful devotee will certainly fall down, bereft of his pious credit.
Srimad Bhagavatam Canto 10, Chapter 74, Text 39
Srimad Bhagavatam Canto 10, Chapter 74, Text 41