Shiva Purana
अथ पाशुपतं साक्षाद्व्रतं द्वादशमासिकम् ॥ कारयित्वा मुनिस्तस्मै प्रददौ ज्ञानमुत्तमम् ॥ १९ ॥
This is the twelve-month vow of Pāśupata. The sage had it done and gave him the best knowledge.
english translation
atha pAzupataM sAkSAdvrataM dvAdazamAsikam ॥ kArayitvA munistasmai pradadau jJAnamuttamam ॥ 19 ॥
hk transliteration by Sanscript