Shiva Purana

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अरण्यमाश्रित्य तपश्चकारासुरस्तदा कश्यपजस्सुतार्थम् ।। काष्ठोपमोऽसौ जितरोषदोषस्संदर्शनार्थं तु महेश्वरस्य ।। २९ ।।

He resorted to forest and performed penance for obtaining son. In order to see lord Śiva he performed a rigorous penance conquering the passions of anger etc. and remaining insensible to external sensation as does a log of wood.

english translation

araNyamAzritya tapazcakArAsurastadA kazyapajassutArtham || kASThopamo'sau jitaroSadoSassaMdarzanArthaM tu mahezvarasya || 29 ||

hk transliteration by Sanscript