Shiva Purana

siva.sh/siva-purana/rudra-samhita/32/19

मम स्वामी शिवो यो हि स जातो ब्रह्मणस्तुतः ।। रुद्रनामा पूर्णरूपावतारः परमात्मनः ।। १९।।

sanskrit

My lord and master Śiva has manifested Himself as Brahmā’s son in the name of Rudra. He is the perfect and full-fledged incarnation of the supreme soul.

english translation

mama svAmI zivo yo hi sa jAto brahmaNastutaH || rudranAmA pUrNarUpAvatAraH paramAtmanaH || 19||

hk transliteration by Sanscript