Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 38

Sanskrit:

शूद्रा: प्रतिग्रहीष्यन्ति तपोवेषोपजीविन: ।धर्मं वक्ष्यन्त्यधर्मज्ञा अधिरुह्योत्तमासनम् ॥ ३८ ॥

ITRANS:

śūdrāḥ pratigrahīṣyantitapo-veṣopajīvinaḥdharmaṁ vakṣyanty adharma-jñāadhiruhyottamāsanam

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.