SB 1.6.3
svayambhuva kaya vrttya
vartitam te param vayah
katham cedam udasraksih
kale prapte kalevaram
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O son of Brahma, how did you pass your life after initiation, and how did you attain this body, having quit your old one in due course?
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Narada Muni in his previous life was just an ordinary maidservant’s son, so how he became so perfectly transformed into the spiritual body of eternal life, bliss and knowledge is certainly important. Sri Vyasadeva desired him to disclose the facts for everyone’s satisfaction.