In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Shaikhul Islam Ibn Taymiyyah [rahimahullaah] said: Indeed Ahlul Bidah are more evil than the people of sinful desires and [this is established by way of] text and Ijmaa [consensus of the scholars]; for indeed the Prophet [sallal-laahu-alayhi-wasallam] commanded that the khawaarij are to be fought [i. e. by the Muslim ruler] [Ref 1]; but he [sallal-laahu-alayhi-wasallam] forbade [us] from fighting the oppressive rulers. And he [sallal laahu alayhi wasallam] said about the man who drank alcohol [i.e. the one who was brought to the Messenger due to drunkenness: “Do not curse him, for indeed he loves Allah and His Messenger”; [Ref 2]; but he [sallal laahu alayhi wasallam] said about Dhul Khuwaysirah: A people will appear from this man, who will recite the Qur’aan but it will not go beyond their throats and they will exit the religion as an arrow passes through a target. You will belittle your prayer compared to their prayer, your fasting compared to their fasting and your recitation of the Qur’aan compared to their recitation. Kill them wherever you find them [i.e. whenever they come out to fight, the Muslim ruler should rally his armies against them; for indeed there is a reward on the day of judgement for the one who kills them. [Majmoo 20/103-105]
[Ref2: Ruling on the one who drinks alcohol: Anas (radiyallaahu-anhu) narrated that the Prophet (sallal-laahu-alayhi-wasallam) flogged the one who drank wine with palm branches stripped of their leaves and with shoes. [Saheeh Muslimm 3281] [i.e. the Muslim ruler is the one who will apply this punishment and no one else]