2 Chronicles 16:12

Thirty and ninth year. Since Asa reigned 41 years (v. 13), he must have been seriously ill during the last two years of his reign. The chronological pattern of the reigns of Asa and Jehoshaphat indicates that during the last three or four years of Asa’s reign, Jehoshaphat was reigning jointly with him. Asa’s illness may have caused the king to associate his son with him on the throne.

To the physicians. Not only in war and national policies did Asa place an undue dependence upon the aid of man, but in sickness as well. How weak the faith of him who had once been so strong! One victory is never a certain guarantee of another. Strength today is no assurance of strength tomorrow. On the occasion of his great victory over Zerah, Asa was strong in faith and mighty in deed. But it is such men of strength who become the main targets of the enemy. Instead of growing in strength and courage, Asa declined, till he spent the last few years of his life sick, disappointed, and embittered, with little faith in God and receiving little help from man.