(2 Kings 11) His work

Then Jehoiada made a covenant between the LORD and the king and the people that they would be the LORD’s people. He also made a covenant between the king and the people. And all the people of the land went over to the temple of Baal and tore it down. They demolished the altars and smashed the idols to pieces, and they killed Mattan the priest of Baal in front of the altars.

God raises up men to do His work.  Jehu was a warrior.  Jehoiada was a priest.  Both were servants of God.