Luke 5:12-16

(12) And it came to pass, when he was in a certain city, behold, a man full of leprosy; who seeing Jesus, fell on his face, and besought him, saying, Lord, if thou wilt, thou canst make me clean. (13) And he put forth his hand, and touched him, saying, I will; Be thou clean; and immediately the leprosy departed from him. (14) And he charged him to tell no man: but go, and shew thyself to the priest, and offer for thy cleansing according as Moses commanded, for a testimony unto them. (15) But so much the more went there a fame abroad of him: and great multitudes came together to hear: and to be healed by him of their infirmities. (16) And he withdrew himself into the wilderness, and prayed.

For observations on the history of the leper, See Matthew 8:2, etc.