2 Kings 5:13-15

But his servants caught up with him and said, “Father, if the prophet had asked you to do something hard and heroic, wouldn’t you have done it? So why not this simple ‘wash and be clean’?” So he did it. He went down and immersed himself in the Jordan seven times, following the orders of the Holy Man. His skin was healed; it was like the skin of a little baby. He was as good as new. He then went back to the Holy Man, he and his entourage, stood before him, and said, “I now know beyond a shadow of a doubt that there is no God anywhere on earth other than the God of Israel. In gratitude let me give you a gift.”