Shiva Purana

siva.sh/siva-purana/saturda-samhita/15/65

अपावनानि सर्वाणि वह्निसंसर्गतः क्षणात् ।। पावनानि भवन्त्येव तस्माद्यः पावकः स्मृतः।। ६५।।

sanskrit

All unholy things become pure the moment they come into contact with fire. Therefore fire is called Purifier,

english translation

apAvanAni sarvANi vahnisaMsargataH kSaNAt || pAvanAni bhavantyeva tasmAdyaH pAvakaH smRtaH|| 65||

hk transliteration by Sanscript