2 Kings 2:20-21

20Elisha said, ‘Bring a new bowl to me with some salt in it.’ So they brought it to him.

21Then Elisha went out to the city's spring of water. He threw the salt into it. He said, ‘This is what the Lord says: “I have made this water clean again. It will no longer cause people to die. The land will no longer be useless for crops.” ’