Caitanya-caritāmṛta 10.97
mahāprabhura līlā yata bāhira-antara dui bhāi tāṅra mukhe śune nirantara
[mahaaprabhura leelaa yata baahira-antara dui bhaai taanra mukhe shune nirantara]
Blended reading (Sanskrit + English inline)
mahāprabhura līlā yata bāhira-antara dui bhāi tāṅra mukhe śune nirantara
Because Raghunātha dāsa Gosvāmī was an assistant to Svarūpa Dāmodara, he knew much about the external and internal features of the pastimes of Lord Caitanya. Thus the two brothers Rūpa and Sanātana always used to hear of this from him.
My note
Source: vedabase.io