Shiva Purana
अद्यापि ते महारुद्रास्सर्वे शिवस्वरूपकाः ॥ देवानां रक्षणार्थाय विराजन्ते सदा दिवि ॥ ३० ॥
Even today the great Rudras, identical with Śiva, shine always in the sky for the protection of the gods.
english translation
adyApi te mahArudrAssarve zivasvarUpakAH ॥ devAnAM rakSaNArthAya virAjante sadA divi ॥ 30 ॥
hk transliteration by Sanscript