2 Kings 2:19-22 (ESV)
Verse 19- Now the men of the city said to Elisha, “Behold, the situation of this city is pleasant, as my lord sees; but the water is bad, and the land is unfruitful.”
V20- He said, “Bring me a new bowl, and put salt in it.” So they brought it to him.
V21- 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.”
V22- So the water has been wholesome to this day, according to the word which Elisha spoke.