The prophet Elisha used salt in the Bible. In the book of 2 Kings 2:19-22, Elisha is approached by the people of Jericho, who complain that their water is bad, making the land barren. Elisha asks for a new bowl and some salt, then goes to the spring and throws the salt into it. He declares that the Lord has healed the water, and it is made pure.
This story demonstrates Elisha's power and authority, as he heals the water simply by using salt. Salt, in the Bible, often symbolizes purity, preservation, and covenant.