CC Madhya 7.148
acirāte kṛṣṇa tomā karibena aṅgīkāra”
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, after Śrī Caitanya Mahāprabhu cured him He instructed him to preach Kṛṣṇa consciousness. Indeed, the only return the Lord wanted was that Vāsudeva preach the instructions of Kṛṣṇa and liberate all human beings. That is the process of the International Society for Krishna Consciousness. Each and every member of this Society was rescued from a very abominable condition, but now they are engaged in preaching the cult of Kṛṣṇa consciousness. They are not only cured of the disease called materialism but are also living a very happy life. Everyone accepts them as great devotees of Kṛṣṇa, and their qualities are manifest in their very faces. 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.