2 Kings 2:20

18They came back to him while he stayed at Jericho; and he said to them, “Didn’t I tell you, ‘Don’t go’?”

19The men of the city said to Elisha, “Behold, please, the situation of this city is pleasant, as my lord sees; but the water is bad, and the land is barren.”

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

21He went out to the spring of the waters, and threw salt into it, and said, “The LORD says, ‘I have healed these waters. There shall not be from there any more death or barren wasteland.’”

22So the waters were healed to this day, according to Elisha’s word which he spoke.