CC Madhya-lila 08.099 - Padma Purana
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 8.99, Translation and Purport:
“"Just as Śrīmatī Rādhārāṇī is most dear to Śrī Kṛṣṇa, Her bathing place (Rādhā-kuṇḍa) is also dear to Him. Among all the gopīs, Śrīmatī Rādhārāṇī is supermost and very dear to Lord Kṛṣṇa."
This verse is from the Padma Purāṇa and is included in the Laghu-bhāgavatāmṛta (2.1.45), by Śrīla Rūpa Gosvāmī. It also appears in the Ādi-līlā, Chapter Four, verse 215, and again in the Madhya-līlā, Chapter Eighteen, verse 8.