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10 This is how people can know who are God's children and who are the devil's children. Everyone who does not do right is not God's child. And anyone who does not love his brother is not God's child.

11 This is the word you have heard from the beginning. `We must love one another.'

12 We must not be like Cain. He was a child of the devil and killed his brother. Why did he kill him? He killed him because the things he himself did were wrong, and the things his brother did were right with God.

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