Shiva Purana
अथ च्छिन्नं विधिशिरो दृष्ट्वा भीततरो हरिः ॥ शातरुद्रियमन्त्रैश्च भक्त्या तुष्टाव शङ्करम् ॥ ५४॥
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