2 Chronicles 22:10

Overview - 2 Chronicles 22
1	Ahaziah succeeding, reigns wickedly.
5	In his confederacy with Joram, the son of Ahab, he is slain by Jehu.
10	Athaliah, destroying all the seed royal, save Joash, whom Jehoshabeath his aunt hid, usurps the kingdom.

2 Chronicles 22:10  (King James Version)
But when Athaliah the mother of Ahaziah saw that her son was dead, she arose and destroyed all the seed royal of the house of Judah.