Ikrimah reports that once some heretics were brought to Sayyiduna Ali (may Allah be pleased with him), and they had some books with them. By the order of Sayyiduna Ali (may Allah be pleased with him), a fire was kindled, and then he burned those people along with their books. When Sayyiduna Ibn Abbas (may Allah be pleased with them both) found out, he said: If I had been there, I would not have burned them in the fire, because the Prophet (peace and blessings be upon him) said: "Do not punish anyone with the punishment of Allah." Rather, I would have killed them, because the Prophet (peace and blessings be upon him) said: "Whoever changes his religion, kill him."