Srimad Bhagavatam Canto 10, Chapter 80, Text 06

SB 10.80.6

sri-suka uvaca
krsnasyasit sakha kascid
 brahmano brahma-vittamah
virakta indriyarthesu
 prasantatma jitendriyah
 
Translation: 
 
Sukadeva Gosvami said: Lord Krsna had a certain brahmana friend [named Sudama] who was most learned in Vedic knowledge and detached from all sense enjoyment. Furthermore, his mind was peaceful and his senses subdued.
Srimad Bhagavatam Canto 10, Chapter 80, Text 05
Srimad Bhagavatam Canto 10, Chapter 80, Text 07