”As for rebelling against them (i.e. the rulers) and fighting them, it is forbidden by way of consensus of the Muslims (i.e. scholars of Islam) even if they (i.e. rulers) are sinful and oppressive. And indeed the ahaadeeth are manifestly clear regarding what we have mentioned and Ahlus Sunnah (i.e. the Ulama of Ahlus Sunnah) have consensus that the ruler is not removed due to (him being) sinful.” [Sharh An-Nawawi 12/229]
Shaikhul Islaam Ibn Taymiyyah (rahimahullaah) said:
”The leaders of the people of Bidah are more harmful upon the Ummah than the sinful people; so because of this the Prophet (sallal-laahu-alayhi-wasallam) commanded that the khawaarij are killed (i.e. fought and killed by the Muslim ruler) and he prohibited (us) from fighting the oppressive rulers.” [Majoo Al-Fataawaa 7/284]
Shaikhul Islaam Ibn Taymiyyah (rahimahullaah) said at the end of his life: ”I regret losing most of my time in other than the meanings (or explanations) of the Qur’aan.”
[Source: ذيل طبقات الحنابلة لابن رجبof Ibn Rajab: 2/402]
”Strive today to actualise Tawheed; for indeed (you) cannot reach Allaah’s (pleasure) except by way of it. Be eager to establish the rights of Tawheed, because you cannot be saved from Allaah’s punishment except through it.” [Kalimah Al-Ikhlaas: page 54]
”knowledge is not about narrating a lot; rather it is light that Allaah places in the heart. Its prerequisite (for application) is adherence to the [Sunnah of the Prophet (sallal-laahu-alayhi-wasallam)], fleeing from desires and innovation.”