Mark 1:40-45
1:40 A leper came to him begging him, and kneeling he said to him, "If you choose, you can make me clean." 

1:41 Moved with pity, Jesus stretched out his hand and touched him, and said to him, "I do choose. Be made clean!" 

1:42 Immediately the leprosy left him, and he was made clean. 

1:43 After sternly warning him he sent him away at once, 

1:44 saying to him, "See that you say nothing to anyone; but go, show yourself to the priest, and offer for your cleansing what Moses commanded, as a testimony to them." 

1:45 But he went out and began to proclaim it freely, and to spread the word, so that Jesus could no longer go into a town openly, but stayed out in the country; and people came to him from every quarter.