There was a brāhmaṇa named Vāsudeva, who was a great person but was suffering from leprosy. Indeed, his body was filled with living worms. Although suffering from leprosy, the brāhmaṇa Vāsudeva was enlightened. As soon as one worm fell from his body, he would pick it up and place it back again in the same location. Then one night Vāsudeva heard of Lord Caitanya Mahāprabhu’s arrival, and in the morning he came to see the Lord at the house of Kūrma. When the leper Vāsudeva came to Kūrma’s house to see Caitanya Mahāprabhu, he was informed that the Lord had already left. The leper then fell to the ground unconscious. When Vāsudeva, the leper brāhmaṇa, was lamenting due to not being able to see Caitanya Mahāprabhu, the Lord immediately returned to that spot and embraced him. When Śrī Caitanya Mahāprabhu touched him, both the leprosy and his distress went to a distant place. Indeed, Vāsudeva’s body became very beautiful, to his great happiness. The brāhmaṇa Vāsudeva was astonished to behold the wonderful mercy of Śrī Caitanya Mahāprabhu, and he began to recite a verse from Śrīmad-Bhāgavatam, touching the Lord’s lotus feet. He said, “Who am I? A sinful, poor friend of a brāhmaṇa. And who is Kṛṣṇa? The Supreme Personality of Godhead, full in six opulences. Nonetheless, He has embraced me with His two arms.” The brāhmaṇa Vāsudeva continued, “O my merciful Lord, such mercy is not possible for ordinary living entities. Such mercy can be found only in You. Upon seeing me, even a sinful person goes away due to my bad bodily odor. Yet You have touched me. Such is the independent behavior of the Supreme Personality of Godhead.” Being meek and humble, the brāhmaṇa Vāsudeva worried that he would become proud after being cured by the grace of Śrī Caitanya Mahāprabhu. To protect the brāhmaṇa, Śrī Caitanya Mahāprabhu advised him to chant the Hare Kṛṣṇa mantra incessantly. By doing so, he would never become unnecessarily proud. Śrī Caitanya Mahāprabhu also advised Vāsudeva to preach about Kṛṣṇa and thus liberate living entities. As a result, Kṛṣṇa would very soon accept him as His devotee. Although Vāsudeva Vipra was a leper and had suffered greatly, still Śrī Caitanya Mahāprabhu cured him. The only return the Lord wanted was that Vāsudeva preach the instructions of Kṛṣṇa and liberate all human beings. If one wants to be recognized as a devotee by Kṛṣṇa, he should take to preaching work, following the advice of Śrī Caitanya Mahāprabhu. Then one will undoubtedly attain the lotus feet of Śrī Kṛṣṇa Caitanya, Lord Kṛṣṇa Himself, without delay.
Ref >> Srila Prabhupada Vani.