Shiva Purana
बहुकालो व्यतीयाय तस्मिंस्तपति सत्तपः ॥ आविर्बभूव तत्कात्तु शुचिर्ज्वाला महीयसी ॥ ६ ॥
A long time elapsed while he performed the holy penance. A holy flame of fire came out of him.
english translation
bahukAlo vyatIyAya tasmiMstapati sattapaH ॥ AvirbabhUva tatkAttu zucirjvAlA mahIyasI ॥ 6 ॥
hk transliteration by Sanscript