Srimad Bhagavatam 11:2:55
विसृजति हृदयं न यस्य साक्षाद्धरिर् अवशाभिहितोऽप्य अघौघ-नाशः ।
प्रणय-रसनया धृताङ्घ्रि-पद्मः स भवति भागवत-प्रधान उक्तः ॥
The utterance of the name of Hari will absolve one of all sins even when such utterance is made only when one is in great trouble or even unintentionally or unwillingly.
The devotee who has taken shelter under the Lotus Feet of the lord and Chants the Divine name with love, The Lord Hari resides in their heart and never leaves. The one who has thus captured the Lord in their heart by Love is considered the chief among the devotees of the Lord, Bhagavatha Pradhana.
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji