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Narrated Ikrima: Ali burnt some people and this news reached Ibn ‘Abbas, who said, “Had I been in his place I would not have burnt them, as the Prophet said, ‘Don’t punish (anybody) with Allah’s Punishment.’ No doubt, I would have killed them, for the Prophet said, ‘If somebody (a Muslim) discards his religion, kill him.’ “
Sahih Bukhari 4:52:260