Vaishnava Samhita. Narasimha Mehta Charitam I. Vol III Book VI Chp 15 Shloka 2

बिलमेव हि तच्छ्रोत्रं यः शृणोति न चादरात्  |
पुण्यश्लोकस्य चरितं मङ्गलं कल्मषापहम्  ||

The ears of that man who does not give audience with true devotion to the narration of the sacred story of Shri Bhagavan, the Punyashloka, which is capable of eradicating all evils, are comparable to snake-hills.