My dear Vidura, I have summarily explained the causes of devastation. One who hears this description three times attains piety and washes the sinful contamination from his soul.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सङ्ग्रहेण मयाऽऽख्यातः प्रतिसर्गस्तवानघ । त्रिः श्रुत्वैतत्पुमान् पुण्यं विधुनोत्यात्मनो मलम्
saṅgraheṇa mayā''khyātaḥ pratisargastavānagha | triḥ śrutvaitatpumān puṇyaṃ vidhunotyātmano malam
SB 4.8.5