CC Madhya 1.60

prabhu-mukhe loka śuni’ śrī-rūpa-gosāñi
sei ślokera artha-śloka karilā tathāi
Synonyms: 
prabhu-mukhe — in the mouth of Lord Śrī Caitanya Mahāprabhu; śloka — the verse; śuni’ — hearing; śrī-rūpa-gosāñi — Śrīla Rūpa Gosvāmī; sei — that; ślokera — of the first verse; artha — giving the meaning; śloka — another verse; karilā — composed; tathāi — immediately.
Translation: 
Although the meaning of the verse was known only to Svarūpa Dāmodara, Rūpa Gosvāmī, after hearing it from Śrī Caitanya Mahāprabhu, immediately composed another verse that described the meaning of the original verse.