Shiva Purana

siva.sh/siva-purana/saturda-samhita/13/17

तेनैवास्या मुखे स्थित्वा वाक्स्वरूपेण शम्भुना ।। व्याहृतं कोऽन्यथा कर्त्तुमु त्सहेत भवेदिदम् ।। १७ ।।

sanskrit

It is by Śiva himself stationing himself in her mouth in the form of speech that this has been said. This alone is possible. Who else could have endeavoured to say so?”

english translation

tenaivAsyA mukhe sthitvA vAksvarUpeNa zambhunA || vyAhRtaM ko'nyathA karttumu tsaheta bhavedidam || 17 ||

hk transliteration by Sanscript