Shiva Purana

siva.sh/siva-purana/saturda-samhita/26/42

ततस्स वैश्यश्शिव एक एव प्रदक्षिणीकृत्य समिद्धमग्निम् ।। विवेश पश्यत्सु नरेषु धीरः सुकौतुकी संगतिभावमिच्छुः ।। ४२ ।।

sanskrit

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