Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 9

Sanskrit:

श्रीभगवानुवाचस्वायम्भुव ब्रह्मसत्रं जनलोकेऽभवत् पुरा ।तत्रस्थानां मानसानां मुनीनामूर्ध्वरेतसाम् ॥ ९ ॥

ITRANS:

śrī-bhagavān uvācasvāyambhuva brahma-satraṁjana-loke ’bhavat purātatra-sthānāṁ mānasānāṁmunīnām ūrdhva-retasām

Translation:

The Personality of Godhead said: O son of self-born Brahmā, once long ago on Janaloka, wise sages who resided there performed a great sacrifice to the Absolute Truth by vibrating transcendental sounds. These sages, mental sons of Brahmā, were all perfect celibates.

Purport:

Śrīla Śrīdhara Svāmī explains that the word satram here refers to a Vedic sacrifice in which all the participants are equally qualified to serve as priests. In this instance, each of the sages present in Janaloka could speak equally well on the topic of Brahman.