Upon his return to Purī, Rāja Pratāparudra-deva and several paṇḍita brāhmaṇas joined the banner of Caitanya Mahāprabhu. He was now twenty-seven years of age. In his twenty-eighth year he went to Bengal as far as Gauḍa in Malda. There he picked up two great personages named Rūpa and Sanātana. Though descended from the lines of the Karṇātic brāhmaṇas, these two brothers turned demi-Moslems by their continual contact with Hussain Shah, the then Emperor of Gauḍa. Their names had been changed by the Emperor into Dabira Khāsa and Sākara Mallika, and their master loved them heartily since they were both learned in Persian, Arabic and Sanskrit and were loyal servants of the state. The two gentlemen had found no way to come back as regular Hindus and had written to Mahāprabhu for spiritual help while he was at Purī. Mahāprabhu had written in reply that he would come to them and extricate them from their spiritual difficulties. Now that he had come to Gauḍa, both the brothers appeared before him with their long-standing prayer. Mahāprabhu ordered them to go to Vṛndāvana and meet him there.
Caitanya returned to Purī through Śāntipura, where he again met his dear mother. After a short stay at Purī he left for Vṛndāvana. This time he was accompanied by one Balabhadra Bhaṭṭācārya. He visited Vṛndāvana and came down to Prayāga (Allahabad), converting a large number of Mohammedans to Vaiṣṇavism by argument from the Koran. The descendants of those converts are still known as Pāṭhāna Vaiṣṇavas. Rūpa Gosvāmī met him at Allahabad. Caitanya trained him up in spirituality in ten days and directed him to go to Vṛndāvana on missions. His first mission was to write theological works explaining scientifically pure bhakti and premā. The second mission was to revive the places where Kṛṣṇacandra had in the end of Dvāpara-yuga exhibited His spiritual līlā (pastimes) for the benefit of the religious world. Rūpa Gosvāmī left Allahabad for Vṛndāvana, and Mahāprabhu came down to Benares. There he resided in the house of Candraśekhara and accepted his daily bhikṣā (meal) in the house of Tapana Miśra. Here it was that Sanātana Gosvāmī joined him and took instruction for two months in spiritual matters. The biographers, especially Kṛṣṇadāsa Kavirāja, have given us details of Caitanya's teachings to Rūpa and Sanātana. Kṛṣṇadāsa was not a contemporary writer, but he gathered his information from the Gosvāmīs themselves, the direct disciples of Mahāprabhu. Jīva Gosvāmī, who was nephew of Sanātana and Rūpa and who has left us his invaluable work the Ṣaṭ-sandarbha, has philosophized on the precepts of his great leader. We have gathered and summarized the precepts of Caitanya from the books of those great writers.