Bhagavatapurana 6.2.11

6.2.11

na niṣkṛtairuditairbrahmavādibhis tathā viśuddhyaty aghavān vratādibhiḥ /
yathā harernāmapadairudāhṛtais taduttamaślokaguṇopalambhakam //

11. A sinful person is not so (thoroughly and readily) purified by penances and other processes of expiation which Manu and others versed in the Vedas have laid down, as he who is, by uttering those words which are the names of Hari; for that is the means of calling forth in his mind the attributes of the glorious Hari.