Bhagavata Purana 6.2.8

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.