Caitanya-caritāmṛta 7.12
ithe bhakta-bhāva dhare caitanya gosāñi ‘bhakta-svarūpa’ tāṅra nityānanda-bhāi
[ithe bhakta-bhaava dhare chaitanya gosaani ‘bhakta-svaroopa’ taanra nityaananda-bhaai]
Blended reading (Sanskrit + English inline)
ithe bhakta-bhāva dhare caitanya gosāñi ‘bhakta-svarūpa’ tāṅra nityānanda-bhāi
For this reason Śrī Caitanya Mahāprabhu, the supreme teacher, accepts the form of a devotee and accepts Lord Nityānanda as His elder brother.
My note
Source: vedabase.io