Takfeer Of Musaylma Kazzab And Others Burnt Alive By Ali (rta)
They were all punished under apostasy which was a specific punishment for the direct addressees of the Prophet Muhammad (sws). This was in accordance with the law of Itmam-e-Hujjah . For details, Please refer to the following video from 13:29 to 33:44 https://youtu.be/X_qS42689Ds?t=809