CC Madhya 1.94
prathama bhikṣā kaila tāhāṅ, rātre saṅkīrtana
After three days, Lord Caitanya Mahāprabhu came to the house of Advaita Ācārya at Śāntipura and accepted alms there. This was His first acceptance of alms. At night He performed congregational chanting there.
It appears that in His transcendental ecstasy, Śrī Caitanya Mahāprabhu forgot to eat for three continuous days. He was then misled by Nityānanda Prabhu, who said that the river Ganges was the Yamunā. Because the Lord was in the ecstasy of going to Vṛndāvana, He was engladdened to see the Yamunā, although in actuality the river was the Ganges. In this way the Lord was brought to the house of Advaita Prabhu at Śāntipura after three days, and He accepted food there. As long as the Lord remained there, He saw His mother, Śacīdevī, and every night executed congregational chanting with all the devotees.