2 Kings 11:2

2 But Jehosheba went and got Joash, the son of Ahaziah. She was the daughter of King Jehoram and the sister of Ahaziah. She stole Joash away from among the royal princes. All of them were about to be murdered. She put Joash and his nurse in a bedroom. That's how she hid him from Athaliah. And that's why Athaliah didn't kill him.