Charles Spurgeon Commentary 1 Kings 19:15-16

"And Jehovah said unto him, Go, return on thy way to the wilderness of Damascus: and when thou comest, thou shalt anoint Hazael to be king over Syria; and Jehu the son of Nimshi shalt thou anoint to be king over Israel; and Elisha the son of Shaphat of Abel-meholah shalt thou anoint to be prophet in thy room." — 1 Kings 19:15-16 (ASV)

And when thou comest, anoint Hazael to be king over Syria: And Jehu the son of Nimshi shalt thou anoint to be king over Israel: and Elisha the son of Shaphat of Abelmeholah shalt thou anoint to be prophet in thy room.

Thus there shall be a successor to carry on your work when you have really done your part of it.