Caitanya-caritāmṛta 5.116
sei viṣṇu haya yāṅra aṁśāṁśera aṁśa sei prabhu nityānanda — sarva-avataṁsa
[sei vishnu haya yaanra amshaamshera amsha sei prabhu nityaananda — sarva-avatamsa]
Blended reading (Sanskrit + English inline)
sei viṣṇu haya yāṅra aṁśāṁśera aṁśa sei prabhu nityānanda — sarva-avataṁsa
That Lord Viṣṇu is but a part of a part of a plenary portion of Lord Nityānanda, who is the source of all incarnations.
Purport
The Lord of Śvetadvīpa has immense potency for creation and destruction. Śrī Nityānanda Prabhu, being Baladeva Himself, the original form of Saṅkarṣaṇa, is the original form of the Lord of Śvetadvīpa.
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io