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I kill ... I wound ... I will make mine arrows drunk with blood, and my sword shall devour flesh. Deuteronomy 32:39-42
There are only four killings in the last 25 books of the Protestant Old Testament. But each is important in its own way.
In the Purim killings in the book of Esther, God shows us his views on women, thought crimes, and preemptive war.
In the book of Job, we see how God and Satan work together, betting on how a father will react after they kill his children.
In the killing of the prophet Hananiah in the book of Jeremiah, we learn how to tell a true prophet forom a false one. (The false prophet is the one who is killed by God for prophesying good things.)
And then there's the killing of Ezekiel's wife. God killed her to show us how we should mourn the deaths of our friends and family after God kills them. (We shouldn't.)