'Eighteenth' in the Bible

In the eighteenth year of king Jeroboam began Abijah to reign over Judah.

Now in the eighteenth year of his reign, when he had purged the land and the house, he sent Shaphan the son of Azaliah, and Maaseiah the governor of the city, and Joah the son of Joahaz the recorder, to repair the house of Yahweh his God.

In the eighteenth year of the reign of Josiah was this Passover kept.