The Viṣṇudūtas continued: Even previously, while eating and at other times, this Ajāmila would call his son, saying, “My dear Nārāyaṇa, please come here.” Although calling the name of his son, he nevertheless uttered the four syllables nā-rā-ya-ṇa. Simply by chanting the name of Nārāyaṇa in this way, he sufficiently atoned for the sinful reactions of millions of lives.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एतेनैव ह्यघोनोऽस्य कृतं स्यादघनिष्कृतम् । यदा नारायणायेति जगाद चतुरक्षरम्
etenaiva hyaghono'sya kṛtaṃ syādaghaniṣkṛtam | yadā nārāyaṇāyeti jagāda caturakṣaram
SB 6.2.8