Shiva Purana
निवेदयेत्स्वमात्मानं चुलुकोदकवर्त्मना ॥ एवं कृत्वा चिरादेव ज्ञानं पाशुपतं शुभम् ॥ ५५ ॥
One should offer himself to the Lord by following the path of Chulukodaka. Having thus done for a long time he attained the auspicious knowledge of Pashupata.
english translation
nivedayetsvamAtmAnaM culukodakavartmanA ॥ evaM kRtvA cirAdeva jJAnaM pAzupataM zubham ॥ 55 ॥
hk transliteration by Sanscript