Shiva Purana
नादाद्विनिःसृतो बिंदुर्बिंदोदेवस्सदाशिवः ॥ तस्मान्महेश्वरो जातः शुद्धविद्या महेश्वरात् ॥ २० ॥
The Bindu comes out of the Nāda; from Bindu comes out Sadāśiva. From him is born Maheśvara and Suddhavidyā originates from Maheśvara.
english translation
nAdAdviniHsRto biMdurbiMdodevassadAzivaH ॥ tasmAnmahezvaro jAtaH zuddhavidyA mahezvarAt ॥ 20 ॥
hk transliteration by Sanscript