2 Kings 9:1-7

1 Then the prophet Elisha called a member of the company of prophets and said to him, "Gird up your loins; take this flask of oil in your hand, and go to Ramoth-gilead.
2 When you arrive, look there for Jehu son of Jehoshaphat, son of Nimshi; go in and get him to leave his companions, and take him into an inner chamber.
3 Then take the flask of oil, pour it on his head, and say, "Thus says the Lord: I anoint you king over Israel.' Then open the door and flee; do not linger."
4 So the young man, the young prophet, went to Ramoth-gilead.
5 He arrived while the commanders of the army were in council, and he announced, "I have a message for you, commander." "For which one of us?" asked Jehu. "For you, commander."
6 So Jehu got up and went inside; the young man poured the oil on his head, saying to him, "Thus says the Lord the God of Israel: I anoint you king over the people of the Lord, over Israel.
7 You shall strike down the house of your master Ahab, so that I may avenge on Jezebel the blood of my servants the prophets, and the blood of all the servants of the Lord.