Charles Ellicott Commentary 2 Kings 9:1

"And Elisha the prophet called one of the sons of the prophets, and said unto him, Gird up thy loins, and take this vial of oil in thy hand, and go to Ramoth-gilead." — 2 Kings 9:1 (ASV)

JEHU ANOINTED BY ELISHA’S MESSENGER AS KING OF ISRAEL. HE SLAYS JEHORAM. AHAZIAH AND JEZEBEL. (Compare to 2 Chronicles 22:7–9.)

And Elisha the prophet called. —Rather, meanwhile Elisha had called—that is, while Joram was lying ill from his wounds. The Hebrew construction again indicates not so much succession as contemporaneousness.

One of the children (sons) of the prophets. —Rashi says it was Jonah, who is mentioned in 2 Kings 14:25.

Box. —The same word occurs again only in 1 Samuel 10:1. Render, phial.