Shiva Purana
तन्दृष्ट्वा स्वसुतन्दिव्यं स्वरूपम्मुनिकामिनी॥ सुवर्चाज्ञाय मनसा साक्षाद्रुद्रावतारकम्॥ ४८॥
Seeing the divine form of her son the lover of sages Knowing Suvarcha in his mind he was directly the incarnation of Rudra.
english translation
tandRSTvA svasutandivyaM svarUpammunikAminI॥ suvarcAjJAya manasA sAkSAdrudrAvatArakam॥ 48॥
hk transliteration by Sanscript