II Kings 2:19-22 (Eve of the Theophany)
Now the men of the city said to Eli'sha, "Behold, the situation of this city is pleasant, as my lord sees; but the water is bad, and the land is unfruitful." He said, "Bring me a new bowl, and put salt in it." So they brought it to him. Then he went to the spring of water and threw salt in it, and said, "Thus says the LORD, I have made this water wholesome; henceforth neither death nor miscarriage shall come from it." So the water has been wholesome to this day, according to the word which Eli'sha spoke.