Shiva Purana
अथोपवेश्य तं शिष्यं शिवमभ्यर्च्य पूर्ववत् ॥ लब्धानुज्ञः शिवाच्छैवीं विद्यामस्मै समादिशेत् ॥ ५७ ॥
Then after making the disciple sit and worship Śiva as before he shall secure permission from the lord and impart Śiva’s knowledge to him.
english translation
athopavezya taM ziSyaM zivamabhyarcya pUrvavat ॥ labdhAnujJaH zivAcchaivIM vidyAmasmai samAdizet ॥ 57 ॥
hk transliteration by Sanscript