'Eighteenth' in the Bible

In the eighteenth year of King Jeroboam, Abijah became king 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 an official of the city, and Joah the son of Joahaz the recorder, to repair the house of the Lord his God.

In the eighteenth year of Josiah’s reign this Passover was celebrated.