CC Ādi 17.315

teṅho ta’ caitanya-kṛṣṇa — śacīra nandana
tṛtīya paricchede janmera ‘sāmānya’ kāraṇa
Synonyms: 
teṅho — He; ta’ — certainly; caitanya-kṛṣṇa — Kṛṣṇa with the name of Śrī Caitanya; śacīra nandana — the son of Śacīmātā; tṛtīya paricchede — in the third chapter; janmera — of His birth; sāmānya — general; kāraṇa — reason.
Translation: 
Śrī Kṛṣṇa Caitanya Mahāprabhu, who is Kṛṣṇa Himself, has now appeared as the son of mother Śacī. The third chapter describes the general cause of His appearance.