Thematic Bible: Purifies the waters of jericho by casting salt into the fountain

The men who lived in the city addressed Elisha. "Look now," they said, "our city's location is good, as you have been observing, but the water springs here are bad and the land isn't sustaining crops." Elisha ordered them, "Bring me a new bowl and put some salt in it." So they brought him what he had requested. Elisha went out to the springs, threw the salt into them, and declared, "This is what the LORD says: "I have purified these waters. Neither death nor barrenness is to flow from them anymore.'" read more.
As a result, the water springs remain pure to this day, just as Elisha had declared.