Shiva Purana

siva.sh/siva-purana/saturda-samhita/8/54

अथ च्छिन्नं विधिशिरो दृष्ट्वा भीततरो हरिः ।। शातरुद्रियमन्त्रैश्च भक्त्या तुष्टाव शङ्करम् ।। ५४।।

sanskrit

On seeing Brahma’s (Brahmā’s?) head cut off, Viṣṇu became terribly afraid. Devotedly he repeated the Śatarudriya mantras and eulogised Śiva.

english translation

atha cchinnaM vidhiziro dRSTvA bhItataro hariH || zAtarudriyamantraizca bhaktyA tuSTAva zaGkaram || 54||

hk transliteration by Sanscript