2 Kings 8:26

(o) Two and twenty years old [was] Ahaziah when he began to reign; and he reigned one year in Jerusalem. And his mother's name [was] Athaliah, the daughter of Omri king of Israel.

(o) Which is to be understood, that he was made king when his father reigned, but after his father's death he was confirmed king when he was forty-two years old, as in (2 Chronicles 22:2).