Shiva Purana
इत्थं महत्परं दिव्यं शास्त्रमुक्तं शिवेन तु ॥ तपसः कथनार्थाय स्वर्गमोक्षप्रसाधनम् ॥ ४५ ॥
This great divine Śāstra has been narrated by Śiva in the context of penance as a means to achieving heaven and salvation.
english translation
itthaM mahatparaM divyaM zAstramuktaM zivena tu ॥ tapasaH kathanArthAya svargamokSaprasAdhanam ॥ 45 ॥
hk transliteration by Sanscript