Shiva Purana
तेन प्रोक्तमहं शम्भुर्भविष्यामि कभालतः ॥ रुद्रो नाम स विख्यातो लोकानुग्रहकारकः ॥ ८ ॥
This was said by him, “I will be Śiva with fire in my forehead.” He became famous by the name Rudra. He is the cause of blessing the worlds.
english translation
tena proktamahaM zambhurbhaviSyAmi kabhAlataH ॥ rudro nAma sa vikhyAto lokAnugrahakArakaH ॥ 8 ॥
hk transliteration by Sanscript