Shiva Purana
सर्वपापविनिर्मुक्तः शिवलोके महीयते ॥ एतद्व्रतोत्तमं गुह्यं शिवलिंगमहाव्रतम् ॥ १७ ॥
Freed from all sins he attains the world of Lord Śiva This is the best and secret vow of the great Shiva Linga.
english translation
sarvapApavinirmuktaH zivaloke mahIyate ॥ etadvratottamaM guhyaM zivaliMgamahAvratam ॥ 17 ॥
hk transliteration by Sanscript