Caitanya-caritāmṛta 2.109
sei kṛṣṇa avatārī vrajendra-kumāra āpane caitanya-rūpe kaila avatāra
[sei krishna avataaree vrajendra-kumaara aapane chaitanya-roope kaila avataara]
Blended reading (Sanskrit + English inline)
sei kṛṣṇa avatārī vrajendra-kumāra āpane caitanya-rūpe kaila avatāra
That same Lord Kṛṣṇa, the fountainhead of all incarnations, is known as the son of the King of Vraja. He has descended personally as Lord Śrī Caitanya Mahāprabhu.
My note
Source: vedabase.io