Shiva Purana

siva.sh/siva-purana/saturda-samhita/1/44

ईशानाह्वस्वरूपो हि शंकरस्येश्वरः सदा ।। श्रोत्रस्य वचसश्चापि विभोर्व्योम्नस्तथैव च ।। ४४ ।।

sanskrit

The Īśāna form of Śiva is the permanent lord of the organ of hearing, speech and the all-pervading sky.

english translation

IzAnAhvasvarUpo hi zaMkarasyezvaraH sadA || zrotrasya vacasazcApi vibhorvyomnastathaiva ca || 44 ||

hk transliteration by Sanscript