CC Madhya 23.102

pūrve prayāge āmi rasera vicāre
tomāra bhāi rūpe kailuṅ śakti-sañcāre
Word for word: 
pūrve — previously; prayāge — in Prayāga; āmi — I; rasera vicāre — in consideration of different mellows; tomāra bhāi — your brother; rūpe — unto Rūpa Gosvāmī; kailuṅ — I have done; śakti-sañcāre — endowment of all power.
Translation: 
“Previously I empowered your brother Rūpa Gosvāmī to understand these mellows. I did this while instructing him at the Daśāśvamedha-ghāṭa in Prayāga.