CC Madhya-lila 20.373 - Laghu-bha 1.18
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 20.373, Translation and Purport:
“"Whenever the Lord is present in someone by portions of His various potencies, the living entity representing the Lord is called a śaktyāveśa-avatāra—that is, an incarnation invested with special power."
This verse is found in the Laghu-bhāgavatāmṛta (1.18).