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SB 10.87.9
sri-bhagavan uvaca
svayambhuva brahma-satram
jana-loke ’bhavat pura
tatra-sthanam manasanam
muninam urdhva-retasam
Translation:
The Personality of Godhead said: O son of self-born Brahma, 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 Brahma, were all perfect celibates.
Purport:
Srila Sridhara Svami 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.