SB 10.69.16
sampujya deva-rsi-varyam rsih purano
narayano nara-sakho vidhinoditena
vanyabhibhasya mitayamrta-mistaya tam
praha prabho bhagavate karavama he kim
Translation:
After fully worshiping the great sage of the demigods according to Vedic injunctions, Lord Krsna, who is Himself the original sage — Narayana, the friend of Nara — conversed with Narada, and the Lord’s measured speech was as sweet as nectar. Finally the Lord asked Narada, “What may We do for you, Our lord and master?”
Purport:
In this verse the words narayano nara-sakhah indicate that Krsna is Himself the Supreme Lord, Narayana, who appeared as the friend of the sage Nara. In other words, Lord Krsna is rsih puranah, the original and supreme spiritual master. Nevertheless, following the Vedic injunctions (vidhinoditena) that a ksatriya should worship the brahmanas, Lord Krsna happily worshiped His pure devotee Narada Muni.