Caitanya-caritāmṛta 17.248
eka paḍuyā āila prabhuke dekhite ‘gopī’ ‘gopī’ nāma śuni’ lāgila balite
[eka paduyaa aaila prabhuke dekhite ‘gopee’ ‘gopee’ naama shuni’ laagila balite]
Blended reading (Sanskrit + English inline)
eka paḍuyā āila prabhuke dekhite ‘gopī’ ‘gopī’ nāma śuni’ lāgila balite
A student who came to see the Lord was astonished that the Lord was chanting “Gopī! Gopī!” Thus he spoke as follows.
My note
Source: vedabase.io