Just as Srimati Radharani is most dear to Lord Krsna, so Her lake, known as Radha-kunda, is also very dear to Him. Of all the gopis, Srimati Radharani is certainly the most beloved

Expressions researched:
"Just as Śrīmatī Rādhārāṇī is most dear to Lord Kṛṣṇa, so Her lake, known as Rādhā-kuṇḍa, is also very dear to Him. Of all the gopīs, Śrīmatī Rādhārāṇī is certainly the most beloved"

Sri Caitanya-caritamrta

CC Madhya-lila

“‘Just as Śrīmatī Rādhārāṇī is most dear to Lord Kṛṣṇa, so Her lake, known as Rādhā-kuṇḍa, is also very dear to Him. Of all the gopīs, Śrīmatī Rādhārāṇī is certainly the most beloved.’.

CC Madhya 18.8, Translation and Purport

“‘Just as Śrīmatī Rādhārāṇī is most dear to Lord Kṛṣṇa, so Her lake, known as Rādhā-kuṇḍa, is also very dear to Him. Of all the gopīs, Śrīmatī Rādhārāṇī is certainly the most beloved.’

This is a verse from the Padma Purāṇa.