God revealed Himself in the Old Testament through prophecy and miracles.  He put His power, His presence, and His will on display to show people He was God, so they might turn to Him.  He used the prophet Elisha to make sure that His will would be carried out by Hazael and Jehu, to wipe out evil people.  No two servants of God are the same, except in their faith; Elijah and Elisha performed similar miracles, for a different purpose. 2 Kings. VF-2538.