Shiva Purana
ज्योतिर्मण्डलमध्यस्थो ददृशे पुरुषाकृतिः ॥ विधिक्रतुभ्यां तत्रैव महाद्भुततनुर्मुने ॥ ३८ ॥
O sage, then Brahma and Viṣṇu saw a shape in the form of a man in the middle of the mass of flame. Its body was huge and wonderful.
english translation
jyotirmaNDalamadhyastho dadRze puruSAkRtiH ॥ vidhikratubhyAM tatraiva mahAdbhutatanurmune ॥ 38 ॥
hk transliteration by Sanscript