2Ki 1:17-18
When Ahaziah died, according to the word of the Lord through Elijah, as he had no son, he was followed upon the throne by his brother Joram, “in the second year of Joram the son of Jehoshaphat, king of Judah.” This statement is at variance both with that in 2Ki 3:1, to the effect that Joram began to reign in the eighteenth year of Jehoshaphat, and with that in 1Ki 22:52, viz., that Ahaziah ascended the throne in the seventeenth year of the reign of Jehoshaphat, which lasted twenty-five years, and also with the statement in 2Ki 8:16, that Joram of Judah became king over Judah in the fifth year of Joram of Israel. If, for example, Ahaziah of Israel died after a reign of not quite two years, at the most a year and a half, in the eighteenth year of Jehoshaphat; as Jehoshaphat himself reigned twenty-five years, he cannot have died till the seventh year of Joram of Israel, and his son Joram followed him upon the throne. The last of these discrepancies may be solved very simply, from the fact that, according to 2Ki 8:16, Jehoshaphat was still king when his son Joram began to reign so that Jehoshaphat abdicated in favour of his son about two years before his death. And the first discrepancy (that between 2Ki 1:17 and 1Ki 3:1) is removed by Usher (Annales M. ad a.m. 3106 and 3112), Lightfoot, and others, after the example of the Seder Olam, by the assumption of the co-regency. According to this, when Jehoshaphat went with Ahab to Ramoth in Gilead to war against the Syrians, in the eighteenth year of his reign, which runs parallel to the twenty-second year of the reign of Ahab, he appointed his son Joram to the co-regency, and transferred to him the administration of the kingdom. It is from this co-regency that the statement in 2Ki 1:17 is dated, to the effect that Joram of Israel became king in the second year of Joram of Judah. This second year of the co-regency of Joram corresponds to the eighteenth year of the reign of Jehoshaphat (2Ki 3:1). And in the fifth year of his co-regency Jehoshaphat gave up the reins of government entirely to him. It is from this point in time, i.e., from the twenty-third year of Jehoshaphat, that we are to reckon the eight years of the reign of Joram (of Judah), so that he only reigned six years more after his father’s death.
We have no information as to the reason which induced Jehoshaphat to abdicate in favour of his son two years before his death; for there is very little probability in the conjecture of Lightfoot (Opp. i. p. 85), that Jehoshaphat did this when he commenced the war with the Moabites in alliance with Joram of Israel, for the simple reason that the Moabites revolted after the death of Ahab, and Joram made preparations for attacking them immediately after their rebellion (2Ki 3:5-7), so that he must have commenced this expedition before the fifth year of his reign. Hezekiah’s Illness and Recovery. - Compare the parallel account in Isa 38 with Hezekiah’s psalm of thanksgiving for his recovery (Isa 38:9-20 of Isaiah).