SB 4.31.23
maitreya uvaca
iti pracetaso rajann
anyas ca bhagavat-kathah
sravayitva brahma-lokam
yayau svayambhuvo munih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The great sage Maitreya continued: My dear King Vidura, Sri Narada Muni, the son of Lord Brahma, thus described all these relationships with the Supreme Personality of Godhead to the Pracetas. Afterward, he returned to Brahmaloka.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
One has to hear about the Supreme Personality of Godhead from a pure devotee. The Pracetas got this opportunity from the great sage Narada, who told them of the activities of the Supreme Personality of Godhead and His devotees.