Shiva Purana
सो ऽत्याश्रमी च विज्ञेयो महापाशुपतस्तथा ॥ स एव तपतां श्रेष्ठ स एव च महाव्रती ॥ ८५ ॥
He is an Atyāśramin, a Mahāpāśupata, the most excellent of all austere persons and a great Vratin.
english translation
so 'tyAzramI ca vijJeyo mahApAzupatastathA ॥ sa eva tapatAM zreSTha sa eva ca mahAvratI ॥ 85 ॥
hk transliteration by Sanscript