Shiva Purana

siva.sh/siva-purana/saturda-samhita/11/42

तल्ललाटादभूच्छम्भुः सृष्ट्यर्थे तेन भूषणम् ।। अतोऽहं देवदेवस्य तस्य भैरवरूपिणः ।। ४२ ।।

sanskrit

Śiva came out of his forehead. I am the ornament of the lord of gods in the form of Bhairava in the matter of creation.

english translation

tallalATAdabhUcchambhuH sRSTyarthe tena bhUSaNam || ato'haM devadevasya tasya bhairavarUpiNaH || 42 ||

hk transliteration by Sanscript