2 Kings 5:13-14

13And his servants drew near, and spoke to him and said, My father, [if] the prophet had bidden thee [do some] great thing, wouldest thou not have done it? how much rather then, when he says to thee, Wash and be clean?

14Then he went down, and plunged himself seven times in the Jordan, according to the saying of the man of 1God. And his flesh became again like the flesh of a little child, and he was clean.