CC Adi-lila 04.216 - Adi Purana
Sri Caitanya-caritamrta
CC Adi-lila
CC Adi 4.216, Translation and Purport:
"O Pārtha, in all the three planetary systems, this earth is especially fortunate, for on earth is the town of Vṛndāvana. And there the gopīs are especially glorious because among them is My Śrīmatī Rādhārāṇī."
This verse, spoken by Lord Kṛṣṇa to Arjuna, is cited from the Ādi Purāṇa.