The sage Maitreya said: In a former time, the leaders of the universal creation performed a great sacrifice in which all the great sages, philosophers, demigods and fire-gods assembled with their followers.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मैत्रेय उवाच । पुरा विश्वसृजां सत्रे समेताः परमर्षयः । तथामरगणाः सर्वे सानुगा मुनयोऽग्नयः
maitreya uvāca | purā viśvasṛjāṃ satre sametāḥ paramarṣayaḥ | tathāmaragaṇāḥ sarve sānugā munayo'gnayaḥ
SB 4.2.4