Ibn Kathir said:If the Kharijites ever gained power, they would corrupt the entire land, Iraq and Syria.

From

Ibn Kathir said:

“If the Kharijites ever gained power, they would corrupt the entire land, Iraq and Syria. They would not leave a boy or a girl or a man or a woman, for in their view the people have become so corrupt that they cannot be reformed except by mass killing.”

[Al-Bidayah wa Nihayah 10/584]

قال ابن كثير إِذْ لَوْ قَوُوا هَؤُلَاءِ لَأَفْسَدُوا الْأَرْضَ كُلَّهَا عِرَاقًا وَشَامًا وَلَمْ يَتْرُكُوا طِفْلًا وَلَا طِفْلَةَ وَلَا رَجُلًا وَلَا امْرَأَةً لِأَنَّ النَّاسَ عِنْدَهُمْ قَدْ فَسَدُوا فَسَادًا لَا يُصْلِحُهُمْ إِلَّا الْقَتْلُ جُمْلَةً

[10/584 البداية والنهاية]

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Ibn Abbas reported: On the morning of Aqabah the Messenger of Allah, peace and blessings be upon him, said while upon his camel, “Pick up some pebbles for me.” So I picked up seven pebbles about the size of a pea. He began to toss them in his hand, saying, “Throw something like these.” Then he said, “O people, beware of exaggeration in religion for those who came before you were only destroyed because of exaggeration in religion.”[Sunan ibn Majah, 3029]

The Prophet (Allah bless him) stated, “Beware of excessiveness in religion for those before you only perished due to excessiveness in religion.” [Ahmad, Musnad]

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Wahhabi ISIS Khawarij Ideology

^His

Bedrock Wahhabi Ideology

ibn Abd-al-Wahhab Najdi

(Mu-hammed ibn Abd-al-Wahhab at-Tamimi an-Najdi)

b.1117 A.H - d.1206 A.H 

(1703CE - 1792CE)

Founding-Father of Wahhabism

 " The Imam"

of

Wahhabiyyah/Salafism

(Ahle-Hadeeth-Deobandism-Tablighi Jamaat-Taliban...etc

Their Imam Ibn ‘Abdul Wahhab Najdi said:

“The people that ask for intercession through the Prophets and Angels, calling upon them and making supplication through their waseelah in attempt to draw nearer to Allah are committing the greatest of sins. Thus it is permitted to kill them and take their property”  
[Kashf ash-Shubbahaat ]

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Their Imam Ibn ‘Abdul Wahhab Najdi said:

“He who sets up intermediaries between him and Allah, calling unto them and asking them to intercede on his behalf with Allah, and putting trust in them is an infidel [i.e. a Kaafir, a disbeliever] according to the consensus of the scholars”. 
[Nawaaqid ul-Islaam, page:308 ] 

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The Beliefs of Sheikh-ul-Najd