Brihad Bhagavatamrta
Part 1 Chapter 7 Text 153

kevalam paramam dainyam
avalambyasya siksaya
sriman-madana-gopala
caranabjam upasata

TRANSLATION
Encountering a mood of great and single-minded humility, they began worshipping the lotus feet of Sriman Madana-gopala according to Narada’s instructions.