Shiva Purana
ईशानाह्वस्वरूपो हि शंकरस्येश्वरः सदा ॥ श्रोत्रस्य वचसश्चापि विभोर्व्योम्नस्तथैव च ॥ ४४ ॥
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