Shiva Purana

siva.sh/siva-purana/rudra-samhita/181/10

स तेपे मंदरद्रोण्यां तपः परमदारुणम् ।। ऊर्द्ध्वबाहुर्नभोदृष्टिः षादांगुष्ठाश्रितावनिः ।।2.5.43.१०।।

sanskrit

He performed a severe penance in the ravine of the Mandara mountain. Keeping his arms lifted up he fixed his eyes on the sky. He stood on the Earth on his big toes alone.

english translation

sa tepe maMdaradroNyAM tapaH paramadAruNam || UrddhvabAhurnabhodRSTiH SAdAMguSThAzritAvaniH ||2.5.43.10||

hk transliteration by Sanscript