Shiva Purana
इत्युत्वा देवमभ्यर्च्य लब्धानुज्ञः शिवाद्गुरुः ॥ साधनं शिवयोगं च साधकाय समादिशेत् ॥ ७ ॥
After saying this, the preceptor shall worship lord Śiva and secure his formal permission. He shall then impart to the aspirant the Yoga of Śiva, the means of liberation.
english translation
ityutvA devamabhyarcya labdhAnujJaH zivAdguruH ॥ sAdhanaM zivayogaM ca sAdhakAya samAdizet ॥ 7 ॥
hk transliteration by Sanscript