Imaam Malik ibn Anas said “Any Muslim who curses Rasoolullaah saAllaahu alayhi wa salam is killed without being asked to repent.” (Sahnoon ‘al Mudawwanatul Kubra’, Al U’tbi ‘al U’tbiyyah’, Qadi I’yaad ‘ash Shifa bi Ta’rif Huqooq Mustafaa’)
Imaam Ibn Abi Zayd al Qayrawaani (ra) said “If someone speaks disrespectfully of Rasoolullaah saAllaahu alayhi wa salam he [...]

The word “Ikrah” means “force, coercion, compulsion etc.” and “Mukrah,” which comes from the word “ikrah,” literally means “one who is forced.”
Allaah says:
“Whoever disbelieved in Allaah after his belief, except him who is forced thereto and whose heart is at rest with Faith but such as open their breasts to disbelief, on them is wrath [...]

The evidence of Shari’ah indicates that it is obligatory to destroy idols, for example:
Imaam Muslim (969) narrated that Abul-Hayaaj al-Asadi said: Ali ibn Abi Taalib said to me: “Shall I not send you with the same instructions as the Messenger of Allaah (saAllaahu alayhi wa salam) sent me? Do not leave any image without defacing [...]

From the sons of Sheikh Muhammad bin Abdul Wahhab and ‘Hamd bin Naasir, they said in “Durar” (10/136-138) when they were asked ‘verily the believer in Allaah and His messenger when he says or does what would be kufr in ignorance from him regarding it, then do not make takfir upon him until the ‘Hujjah [...]

Aiding the Kuffar and the Incident of Hatib (ra)
1) For takfir to be declared, the nullifiers of Islam must be known. Allah Subhanahu wa Ta’ala says:
“Allah does not lead a people astray after His guidance has been given until He makes clear to them wherein error lies.” [at-Tawbah 9: 115]
Sheikh Muhammad ibn Abdul Wahab - [...]

Principles of Takfir
Imaam Muhammad Ibn Abdul Wahhab
ad-Durar as-Sanniyyah 1/102-104
The Shaykh was asked concerning that for which he fights, and upon what does he make takfir of a person.
He replied,
“The five pillars of Islam. The first of them [by which he disbelieves] is the two testimonies of faith, then the remaining four pillars. However, if he [...]

False Preventions of Takfir
Takfir is to expel a person from Islam, or declare them to be a non-Muslim. Every Muslim is obliged to perform takfir upon an individual whom Allah (SWT) or His Messenger (SAW) deemed to be Kaafir or Murtad (apostate). However, nowadays takfir has become a taboo subject and the enemies of Islam [...]

Ruling On the One Who Defends the Taaghoot
By Shaykh ‘Ali ibn Khudhayr Al-Khudhayr
Question:
“There is a certain individual who defends (in arguments) the Tawaaghit day and night, and the Hujjah (evidence) has been established upon him dozens of times – yet he makes excuses for the actions of the Tawaaghit.  So what is the ruling regarding [...]

Government scholars are the body established by the rulers containing the top scholars of the country, made and sponsored by him, to justify the following:
1. His authority over the country and its people, even though he legislates against what Allaah has revealed, which is a clear kufr, under the Islamic Shari’ah. This nullifies his position [...]

http://hadith.al-islam.com/Display/Display.asp?Doc=0&Rec=2972
Collected by Imaam Bukhaari in his Saheeh vol. 3, Book 31, Hadeeth #115

From Qutaybah ibn Saeed from Isma’eel ibn J’affar from his father Abu Suhail from his father Talha ibn ‘Ubaidullaah:
A bedouin with unkempt hair came to Rasoolullaah sAllaahu alayhi wa salam and said, “O Rasoolullaah! Inform me what Allaah has made obligatory for me [...]