2 Kings 2:20-22

Elisha said, “Bring me a new bowl with salt in it.” So they brought it to him. Then he went out to the spring that supplied the town with water and threw the salt into it. And he said, “This is what the LORD says: I have purified this water. It will no longer cause death or infertility.” And the water has remained pure ever since, just as Elisha said.