Sri Brahma-Samhita

References to text BS 5.39
BS 5.39: I worship Govinda, the primeval Lord, who manifested Himself personally as Kṛṣṇa and the different avatāras in the world in the forms of Rāma, Nṛsiṁha, Vāmana, etc., as His subjective portions.

Text №
“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.”
The Glories Of Lord Nityananda Balarama
CC 1.5.155