爱屋及乌（ài wū jí wū）
There was a state called zhou in the chinese history. One day, the king of zhou asked his officials for advice on dealing with prisoners of war. An official said, "i once heard if you love someone, you are intended to love even the crows on the roof of his house; if you hate someone, you are intended to hate even the walls and the parapets of his. The prisoners of war were enemies fighting against us. In my opinion, we'd better kill them all." But the king.
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