2 Chronicles 22:10-12

10Ahaziah's mother Athaliah heard the news that her son was dead. So she started to kill everyone in Judah's royal family.

11But King Jehoram's daughter Jehosheba rescued Ahaziah's son Joash. When Athaliah's servants had come to murder the royal sons, Jehosheba took Joash away and she hid him. She put him in a bedroom in the temple with his nurse. Jehosheba was Ahaziah's sister and she was the wife of Jehoiada, the priest. So she hid Joash from Athaliah to stop her from killing him.

12Joash stayed safely in a room in God's temple while Queen Athaliah ruled Judah for six years.