Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 9


कस्मान्मुकुन्दो भगवान् पितुर्गेहाद् व्रजं गत: । क्‍व वासं ज्ञातिभि: सार्धं कृतवान् सात्वतांपति: ॥ ९ ॥


kasmān mukundo bhagavānpitur gehād vrajaṁ gataḥkva vāsaṁ jñātibhiḥ sārdhaṁkṛtavān sātvatāṁ patiḥ


Why did Kṛṣṇa, the Supreme Personality of Godhead, leave the house of His father, Vasudeva, and transfer Himself to the house of Nanda in Vṛndāvana? Where did the Lord, the master of the Yadu dynasty, live with His relatives in Vṛndāvana?


These are inquiries about the itinerary of Kṛṣṇa. Just after His birth in the house of Vasudeva in Mathurā, Kṛṣṇa transferred Himself to Gokula, on the other side of the Yamunā, and after some days He moved with His father, mother and other relatives to Nanda-grāma, Vṛndāvana. Mahārāja Parīkṣit was very much eager to hear about Kṛṣṇa’s activities in Vṛndāvana. This entire canto of Śrīmad-Bhāgavatam is full of activities performed in Vṛndāvana and Dvārakā. The first forty chapters describe Kṛṣṇa’s Vṛndāvana affairs, and the next fifty describe Kṛṣṇa’s activities in Dvārakā. Mahārāja Parīkṣit, to fulfill his desire to hear about Kṛṣṇa, requested Śukadeva Gosvāmī to describe these activities in full detail.