Shiva Purana
मंत्रराजं ददौ ताभ्यां ज्ञानसंहितया सह ॥ तौ लब्ध्वा महतीं दिव्यामाज्ञां माहेश्वरीं पराम् ॥ ७९ ॥
He gave them the king of mantras along with the code of knowledge. Having obtained the great divine command of the supreme goddess Maheswari.
english translation
maMtrarAjaM dadau tAbhyAM jJAnasaMhitayA saha ॥ tau labdhvA mahatIM divyAmAjJAM mAhezvarIM parAm ॥ 79 ॥
hk transliteration by Sanscript