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They took the king's sons, and slew seventy persons, and put their heads in baskets, and sent him them to Jezreel. 10:7
Seems suspicious, doesn't it? Especially when you consider how much God hated Benhadad. God killed Ahab and his family for not killing Benhadad. Maybe Hazael did the job for God when he smothered him. 8:7-15