'Thirty' in the Bible

There was no war until the thirty-fifth year of Asa’s reign.

In the thirty-sixth year of Asa, Israel’s King Baasha went to war against Judah. He built Ramah in order to deny access to anyone—going or coming—to Judah’s King Asa.

In the thirty-ninth year of his reign, Asa developed a disease in his feet, and his disease became increasingly severe. Yet even in his disease he didn’t seek the Lord but only the physicians.