2 Kings 5:13-14

13And his servants came near, and spake unto him, and said, My father, if the prophet had bid thee do some great thing, wouldest thou not have done it? how much rather then, when he saith to thee, Wash, and be clean? 14Then went he down, and dipped himself seven times in the Jordan, according to the saying of the man of God; and his flesh came again like unto the flesh of a little child, and he was clean.