It is narrated from Sayyiduna Anas (may Allah be pleased with him) that once some people of the Jat tribe, who had become idol worshippers, were brought to Sayyiduna Ali (may Allah honor his face). He had them burned. When Sayyiduna Ibn Abbas (may Allah be pleased with them both) found out, he said: The Prophet (peace and blessings of Allah be upon him) said, "Whoever changes his religion, kill him."