The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 40

यन्नामकीर्तनं भक्त्या विलापनमनुत्तमम् ।मैत्रेयाशेषपापानां धातूनामिव पावकः ॥

In plain words

O Maitreya, chanting the name of the Lord with devotion is the supreme fire that melts away all sins, just as fire melts the raw ore.

Close to the Sanskrit

Which chanting of the name with devotion is the supreme dissolver, O Maitreya, of all sins, like fire unto metal ores.