Srimad Bhagavatam Canto 12, Chapter 03, Text 38

SB 12.3.38

sudrah pratigrahisyanti
 tapo-vesopajivinah
dharmam vaksyanty adharma-jña
 adhiruhyottamasanam
 
Translation: 
 
Uncultured men will accept charity on behalf of the Lord and will earn their livelihood by making a show of austerity and wearing a mendicant’s dress. Those who know nothing about religion will mount a high seat and presume to speak on religious principles.
 
Purport: 
 
The epidemic of bogus gurus, swamis, priests and so forth is explicitly described here.
Srimad Bhagavatam Canto 12, Chapter 03, Text 37
Srimad Bhagavatam Canto 12, Chapter 03, Text 39-40