2 Kings 2:18-22

18They returned to Elisha while he was staying at Jericho; and he said to them, “Did I not tell you, ‘Do not go’?”

19Then the men of the city said to Elisha, “Look, this city is in a pleasant place, as my lord [Elisha] sees; but the water is bad and the land is barren.”

20He said, “Bring me a new jar, and put salt in it.” So they brought it to him.

21Then Elisha went to the spring of water and threw the salt in it and said, “Thus says the Lord: ‘I [not the salt] have purified and healed these waters; there shall no longer be death or barrenness because of it.’ ”

22So the waters have been purified to this day, in accordance with the word spoken by Elisha.