Shiva Purana
अष्टमूर्त्यात्मना विश्वमधिष्ठाय स्थितं शिवम् ॥ भजस्व सर्वभावेन रुद्रः परमकारणम् ॥ ३३ ॥
With pious emotions worship Śiva who presides over the universe in the form of Aṣṭamūrti Rudra, the great cause.
english translation
aSTamUrtyAtmanA vizvamadhiSThAya sthitaM zivam ॥ bhajasva sarvabhAvena rudraH paramakAraNam ॥ 33 ॥
hk transliteration by Sanscript