Shiva Purana
ततस्स वैश्यश्शिव एक एव प्रदक्षिणीकृत्य समिद्धमग्निम् ॥ विवेश पश्यत्सु नरेषु धीरः सुकौतुकी संगतिभावमिच्छुः ॥ ४२ ॥
Then the merchant who was only Śiva himself went round the blazing fire. Desirous of knowing her intentions he entered the fire firmly.
english translation
tatassa vaizyazziva eka eva pradakSiNIkRtya samiddhamagnim ॥ viveza pazyatsu nareSu dhIraH sukautukI saMgatibhAvamicchuH ॥ 42 ॥
hk transliteration by Sanscript