Shiva Purana

siva.sh/siva-purana/rudra-samhita/9/57

महाप्रलयकृद्रुद्रो विश्वात्मा हृदयोद्भवः ।। त्रिधा भिन्नो ह्यहं विष्णो ब्रह्मविष्णुभवाख्यया ।।५७।।

sanskrit

Rudra who causes great dissolution and who is the soul of the universe is born of the heart. I manifest in the three forms, O Viṣṇu, known Brahmā, Viṣṇu and Bhava.

english translation

mahApralayakRdrudro vizvAtmA hRdayodbhavaH || tridhA bhinno hyahaM viSNo brahmaviSNubhavAkhyayA ||57||

hk transliteration by Sanscript