In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Shaikhul Islaam Ibn Taymiyyah [rahimahullaah] stated, “The Imaams of Ahlus Sunnah Wal-Jamaaa’ah – the people of knowledge and Eemaan- are possessors of Knowledge, Justice and Mercy. They know the truth in a manner in which it is [obligated upon] them- in agreement with the Sunnah and free from innovations. They deal justly with those who are outside of it [i.e. those outside the truth and the Sunnah] even if they oppress them, as Allaah [The Most High] said: [وَلَا يَجْرِمَنَّكُمْ شَنَآنُ قَوْمٍ عَلَىٰ أَلَّا تَعْدِلُوا ۚ اعْدِلُوا هُوَ أَقْرَبُ لِلتَّقْوَىٰ -And let not the enmity and hatred of others make you avoid justice. Be just: that is nearer to piety (5:8)] They are merciful towards the creation, wish good for them, guidance and knowledge. They do not set out wishing evil for them; rather when they [i.e. those Imaams of the Sunnah] punish them, clarify their mistakes, ignorant [views, statements and beliefs] and wrong doing, their intention is to clarify the truth, having mercy for the creation, enjoining good and forbidding evil, in order that the entire religion is established sincerely [for the worship of Allaah alone and adherence to the Sunnah of His Messenger], and so that the word of Allaah is made the uppermost.
[Ar-Radd Alal Bakriy page: 490]
Shaikh Rabee Bin Haadi Al-Madkhali hafidhahullaah] said:
Ibnul Jawzi said, Abul Wafaa Ibn Aqeel Al-Faqee said, our Shaikh Abul Fadl Al-Hamdaani said, “The innovators (in) Islam and the fabricators of Hadeeth are worse than the Mulhiddoon [i.e. the heretics (Ref A)], because the heretics aim to corrupt Islam from the outside, whilst these [people] want to corrupt it from within. They [i.e. the innovators and the fabricators of hadeeth] are similar to the people of a country who try to corrupt its state of affairs and the heretics are similar to those who lay a siege from the outside; so the ones from within [i.e. the innovators and fabricators of hadeeth] open the fortress. Therefore, they are more harmful to Islam than those who do not [attribute] themselves to it outwardly”.[Ref 1]
Imaam Ahmad [rahimahullaah] said, “There is none more harmful on the people of Islaam than the Jahmiyyah; they do not desire except to nullify the Qur’aan and the ahaadeeth of the Messenger [sallal-laahu-alayhi-wasallam]”. [Ref 2]
Al-Haafifh Abdul Ghaniyy Al-Maqdisee [rahimahullaah] said, “Know-may Allaah have mercy upon you-that Islaam and its people are undermined by three groups; and the group that rejects the [authentic] ahaadeeth about the Attributes [of Allaah] and belie its narrators are more harmful to Islaam and its people than the disbelievers”. [Ref 3]
Ibn Aqeel [rahimahullaah] said, “There is none more harmful on the sharee’ah than the innovators of the people of kalaam [i.e. the people of philosophical rhetoric] and the ignorant soofees”. [Ref 4]
Ref A: Ilhaad: Complete Il-haad is to turn away from Islaam completely and that is Major Il-haad, which exits a person from the fold of Islaam, such as the Il-haad of the communists, the idol worshippers and those similar to them. And Minor Il-haad does not exit a person from the Religion of Islaam, such as turning away from some actions. Allaah (The Most High) said: [وَمَن يُرِدْ فِيهِ بِإِلْحَادٍ بِظُلْمٍ نُذِقْهُ مِنْ عَذَابٍ أَلِيمٍ – And whoever inclines to evil actions therein or to do wrong, him We shall cause to taste a painful torment] [22:25] [For further details, see links: http://www.ajurry.com/vb/showthread.php?t=13326 http://www.ibnothaimeen.com/all/noor/article_1802.shtml
Ref 1: Quoted by Shaikh Rabee (may Allaah preserve him) in his Book titled: Al-Mahajjah Al-Baydaa Fee Himaayati As-Sunnati Al-Gharraa’i Min Zallaati Alhlil Akh’taa Wa Zayghi Ahlil Ahwaa’ page: 47]
Ref 2: Tabaqaat Al-Hanaabilah 1/47
Ref 3: Al-Iqtisaad Fil I’tiqaad page: 223
Ref 4: As-Sawaa-iq Al-Mursalah Alal Jahmiyyah Wal-Mu-attilah 4/1346