This is part of a series. I recommend starting with the first installment.
In the first part we laid out the dilemma that Hosea presents. The accounts in 2 Kings 9:6-10 and 2 Kings 10:30 when compared to a prophecy made by Hosea (1:4) suggests that God commanded an act be done, praised the act and then threatened punishment for that same act. In the last post we examined one of the claims that Jehu exceeded what God had commanded. In this post we will examine another aspect to that claim.
The second related premise is that Jehu exceeded his mandate when he killed Ahaziah the king of Judah. The AiG article suggests this when they write that Jehu “even went so far as to kill King Ahaziah of Judah”.
An article on Ligonier also makes this claim (emphasis added).
In 2 Kings 10:12–14, we read that (Jehu) put to death the relatives of King Ahaziah of Judah who were on their way to visit the king at Jezreel. Ahaziah, of course, had met a deserved end at the hands of Jehu for his own idolatry and friendship with Israel (8:25–29; 9:27–28). But the Lord never told Jehu to destroy the family and friends of Judah’s king. Jehu took things too far, showing that he was not motivated solely by a desire to accomplish God’s will with respect to Ahab’s descendants. The prophet Hosea declared that Jehu’s house would eventually fall as a punishment for this bloodshed at Jezreel (Hos. 1:4–5). (link)

It is true that we don’t have text that explicitly shows that God asked Jehu to kill Ahaziah the king of Judah. But if we examine other texts we can present a reasonable case that Jehu killing Ahaziah was right in the eyes of God as well.
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