Shiva Purana
पुराहमथ संभ्रांतो ह्यन्यसाधनसंभ्रमः । अचले मंदरे शैले तपश्चरणमाचरम् १७ ।
Formerly, I too, confounded by other means performed a great penance on the mountain Mandara.
english translation
purAhamatha saMbhrAMto hyanyasAdhanasaMbhramaH । acale maMdare zaile tapazcaraNamAcaram 17 ।
hk transliteration by Sanscript