The Bhāgavata Purāṇa, probably composed in South India in the second half of the first millennium CE, tells the stories of Viṣṇu’s descents, above all Kṛṣṇa’s childhood and youth among the cowherds of Vraja. It joins the philosophy of Vedānta with an ardent devotion and became the scripture of many later devotional movements.
Bhāgavata Purāṇa
The great Purāṇa of devotion to Viṣṇu, especially as Kṛṣṇa, and a classic of Hindu bhakti.
Also: Bhagavata Purana, Srimad Bhagavatam