'Thirteenth' in the Bible

This message from the LORD came to him during the thirteenth year of the reign of Ammon's son Josiah, the king of Judah,

"From the thirteenth year of the reign of Ammon's son Josiah, the king of Judah, until the present time, for 23 years this message from the LORD has come to me, and I've spoken to you again and again, but you haven't listened.