Shiva Purana
ततो राज्यं परित्यज्य शिवधर्मपरायणः ॥ शिववेषधरो भक्त्या दुर्लभं मोक्षमाप्तवान् ॥ ४२॥
Then he forsook the kingdom and engaged himself in the Śiva-cult assuming the guise of Śiva. By virtue of devotion he attained salvation inaccessible to others.
english translation
tato rAjyaM parityajya zivadharmaparAyaNaH ॥ zivaveSadharo bhaktyA durlabhaM mokSamAptavAn ॥ 42॥
hk transliteration by Sanscript