Shiva Purana

siva.sh/siva-purana/rudra-samhita/78/23

ऊर्द्ध्वबाहुश्चैकपादो रविं पश्यन्स चक्षुषा ।। शतवर्षं तपश्चक्रे दृढचित्तो दृढव्रतः ।।२३।।

sanskrit

For a hundred years he performed penance with his hands lifted up, standing on only one leg and gazing at the sun. With his mind steady and firm he observed all sacred rites.

english translation

UrddhvabAhuzcaikapAdo raviM pazyansa cakSuSA || zatavarSaM tapazcakre dRDhacitto dRDhavrataH ||23||

hk transliteration by Sanscript