Upon the birth of Sri Caitanya Mahaprabhu both of them (Advaita Prabhu and Haridasa Thakura) immediately began to dance. But no one in Santipura could understand why those two saintly persons were dancing

Expressions researched:
"upon the birth of Śrī Caitanya Mahāprabhu both of them immediately began to dance. But no one in Śāntipura could understand why those two saintly persons were dancing"

Sri Caitanya-caritamrta

CC Adi-lila

It is understood that Advaita Prabhu, at that time, was in His own paternal house at Śāntipura. Haridāsa Ṭhākura frequently used to meet Him. Coincidentally, therefore, he was also there, and upon the birth of Śrī Caitanya Mahāprabhu both of them immediately began to dance. But no one in Śāntipura could understand why those two saintly persons were dancing.

CC Adi 13.99, Translation and Purport

At that time Śrī Advaita Ācārya Prabhu, in His own house at Śāntipura, was dancing in a pleasing mood. Taking Haridāsa Ṭhākura with Him, He danced and loudly chanted Hare Kṛṣṇa. But why they were dancing, no one could understand.

It is understood that Advaita Prabhu, at that time, was in His own paternal house at Śāntipura. Haridāsa Ṭhākura frequently used to meet Him. Coincidentally, therefore, he was also there, and upon the birth of Śrī Caitanya Mahāprabhu both of them immediately began to dance. But no one in Śāntipura could understand why those two saintly persons were dancing.