Shiva Purana
शमादिधर्मनिरतो वेदान्तज्ञानपारगः ॥ अत्राधिकारी स प्रोक्तो यतिर्विगतमत्सरः ॥ ६६॥
Here the person authorised is the ascetic engaged in the pious activities of self-restraint, the master of Vedāntic knowledge and free from rivalry.
english translation
zamAdidharmanirato vedAntajJAnapAragaH ॥ atrAdhikArI sa prokto yatirvigatamatsaraH ॥ 66॥
hk transliteration by Sanscript