Caitanya-caritāmṛta 5.155
rāmādi-mūrtiṣu kalā-niyamena tiṣṭhan nānāvatāram akarod bhuvaneṣu kintu kṛṣṇaḥ svayaṁ samabhavat paramaḥ pumān yo govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
[raamaadi-moortishu kalaa-niyamena tishthan naanaavataaram akarod bhuvaneshu kintu krishnah svayam samabhavat paramah pumaan yo govindam aadi-purusham tam aham bhajaami]
Blended reading (Sanskrit + English inline)
rāmādi-mūrtiṣu kalā-niyamena tiṣṭhan nānāvatāram akarod bhuvaneṣu kintu kṛṣṇaḥ svayaṁ samabhavat paramaḥ pumān yo govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
“I worship Govinda, the primeval Lord, who by His various plenary portions appears in the world in different forms and incarnations such as Lord Rāma, but who personally appears in His supreme original form as Lord Kṛṣṇa.”
Purport
This is a quotation from Brahma-saṁhitā (5.39).
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io