Shiva Purana
महेश्वरसहस्रांशाद्रुद्रमूर्तिरजायत ॥ अघोरवदनाकारस्तेजस्तत्त्वाधिपश्च सः ॥ ११ ॥
The image Rudra is born of a thousandth part of Maheśvara. He has Aghora for his face. He is the lord of the principle of fire.
english translation
mahezvarasahasrAMzAdrudramUrtirajAyata ॥ aghoravadanAkArastejastattvAdhipazca saH ॥ 11 ॥
hk transliteration by Sanscript