And, behold, there came a leper and knelt before him, saying, "Lord, if you wish it, you can make me clean." And Jesus moved with compassion put forth his hand, and touched him, saying, "I will it to be so; be clean." And immediately his leprosy was cleansed. And Jesus said unto him, strictly warning him, "See that you tell no man; but go your way, show yourself to the priest." But he went out, and began to proclaim it much, and to blaze the matter abroad, insomuch that Jesus could no more openly enter into the city, but He remained out in the desert places: and yet many came to him from every quarter (Mark 1:45). (According to the Law of Moses, if a leper was healed, he had to be inspected and pronounced clean by a priest. See Leviticus chapter thirteen.)
And it came to pass, as he went to Jerusalem, he passed through the midst of Samaria and Galilee. And as he entered into a certain village, there met him ten men that were lepers, which stood afar off. And they lifted up their voices, and said, "Jesus, Master, have mercy on us!" And when he saw them, he said unto them, "Go show yourselves unto the priests." And it came to pass, that, as they went, they were cleansed. And one of them, when he saw that he was healed, turned back, and with a loud voice glorified God, and fell down on his face at Jesus' feet, giving him thanks: and he was a Samaritan. And Jesus answering said, "Were there not ten cleansed? But where are the nine? There are not found any that have returned to give glory to God, except this foreigner?" And He said unto him, "Arise, go your way. Your faith has made you whole" (Luke 17:11-19).