Srimad Bhagavatham : 6.3.31.
Skandham-6. Chapter-3. Slokam-31. tasmat sankirtanam vishnor jagan-mangalam amhasam, mahatam api kauravya viddhy aikantika-nishkrtam. tasmat = therefore; sankirtanam = the congregational chanting of the holy name; vishnoh = of Lord Vishnu; jagat-mangalam = the most auspicious performance within this material world; amhasam = for sinful activities; mahatam api = even though very great; kauravya = O descendant of the Kuru family; viddhi = understand; aikantika = the ultimate; nishkrtam = atonement. Sri Suka Brahmarishi continued: My dear King, the chanting of the holy name of the Lord is able to uproot even the reactions of the greatest sins. We should note that although Ajamila chanted the name of Narayana imperfectly, he was delivered from all sinful reactions. The chanting of the holy name is so auspicious that it can free everyone from the reaction