Shiva Purana
ततः कृत्वा च करुणां प्रणवस्यार्थ मादिशेत् ॥ षड्विधार्त्थपरि ज्ञानसहितं गुरुसत्तमः॥ ८८ ॥
The excellent preceptor shall be sympathetic and explain Praṇava with the knowledge of the six-fold topics.
english translation
tataH kRtvA ca karuNAM praNavasyArtha mAdizet ॥ SaDvidhArtthapari jJAnasahitaM gurusattamaH॥ 88 ॥
hk transliteration by Sanscript