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And from the evil understanding of this Religion is that which was attained by the Khawaarij[6] who revolted and fought against ‘Alee (radiyallaahu ‘anhu). This was because they understood the texts of the Sharee’ah with an erroneous understanding, which contradicted the understanding of the Companions (radiyallaahu ‘anhum). Due to this, when Ibn ‘Abbaas (radiyallaahu ‘anhumaa) debated them, he clarified to them the correct understanding of the texts. So there returned from amongst them those who returned, and the remainder of them did not return back from their misguidance. And the story of his debate with them has been recorded in the Mustadrak (2/150-152) of al-Haakim (d.405H), and the isnaad is saheeh upon the condition of Muslim (d.261H). In it is the statement of Ibn ‘Abbaas, “I have come to you from the Companions of the Messenger of Allaah (sallallaahu ‘alayhi wa sallam), from the Muhaajireen and the Ansaar, so that I may inform you of what they say. They are well aware of what they say, as the Qur’aan was sent down upon them. And they are more knowledgeable concerning the revelation than you, and it was revealed amongst them. And none of them are amongst you.” So some of them said, ‘Do not argue with the Quraysh (i.e. since Ibn ‘Abbaas is from the Quraysh), since Allaah says,
{Rather, they are a quarrelsome people.}, [Sooratuz-Zukhruf, Aayah 58].’
Stated Ibn ‘Abbaas, “And I have come to a people whom I have not seen anyone more severe in striving hard than them. Their faces have become pale from staying up late at night, it is as if their hands and feet do not deter them.” So there remained those who remained. So some of them said, ‘Let us speak with him and let us see what he says.’ ‘I said, ‘Inform me of that which you harbour against the son of the uncle of the Messenger of Allaah (sallallaahu ‘alayhi wa sallam) and his son-in-law, the Muhaajireen and the Ansaar.’ They said, ‘Three issues.’ I said, ‘What are they?’ They said, ‘As for the first of them, then he (‘Alee) has allowed men to judge in the affair of Allaah, yet Allaah the Exalted says,
{The judgement is for none but Allaah.}, [Soorah Yoosuf, Aayah 40]
So it is not for men and it is not for judges.’ So I said, ‘This is only one issue.’ They said, ‘As for the other issues, then he fought his enemies, yet he did not take any prisoners or war booty. So if those whom he fought were disbelievers, then their imprisonment and war booty has been made lawful. And if they were believers, then fighting them is not permissible.’ I said, ‘These are only two issues, so what is the third?’ They said, ‘Indeed, he erased the title, ‘Leader of the Believers’ from himself, so therefore he is the leader of the disbelievers.’ I said, ‘Do you have anything besides this?’ They said, ‘This is sufficient for us.’ So I said to them, ‘Do you hold that if I recite to you from the Book of Allaah and the Sunnah of His Messenger (sallallaahu ‘alayhi wa sallam), that which refutes your statement, that you will obey?’ They said, ‘Yes!’ So I said, ‘As for your statement that he has allowed men to judge concerning from the affair of Allaah, then I shall recite to you that which shows that Allaah relegated His judgement to men concerning the price of four dirhams, concerning a rabbit and its like from game. So Allaah said,
{O you who believe! Do not kill game whilst you are in a state of ihraam.}, [Sooratul-Maa’idah, Aayah 95]
Up until He said,
{…as judged by two just men from amongst you.}, [Sooratul-Maa’idah, Aayah 95]
So I implore you by Allaah: Is the judgement of men with regards to a rabbit and its like from game better, or their judgement concerning their blood and reconciliation between them?! And you must know that if Allaah had wished, He would have judged and not relegated that to the men. And Allaah the Mighty and Majestic has said concerning the woman and her husband,
{And if you fear a breach amongst the two of them, then appoint two arbitrators, one from his family and one from hers. And if they both wish for peace, then Allaah will bring about their reconciliation.}, [Sooratun-Nisaa’, Aayah 35]
So Allaah made the judgement of the men a tradition to be believed in. So do you leave this?” They said, ‘Yes!’ He said, “As for your statement that he fought and he did not take prisoners, nor did he take war booty, then do you revile your mother, ‘Aa’ishah? Then you must declare her lawful in that which you have declared lawful with regards to other than her! So if you were to do that, then you would become disbelievers, as she is your mother. And if you say, ‘She is not our mother,’ then you have disbelieved. Since, Allaah says,
{The Prophet is closer to the Believers than their own selves, and his wives are their mothers.}, [Sooratul-Ahzaab, Aayah 6]
So you are revolving around two positions of misguidance. Regardless of which of them you adopt, you have adopted misguidance.” So they began to look at each other.’ ‘I said, ‘Have you left from this?’ They said, ‘Yes!’ ‘And as for your statement, that he erased the title of ‘Leader of the Believers’ from his name, then I shall come to you with one whom you are pleased with and I shall see you. Indeed, you have heard that on the day of al-Hudaybiyyah, the Prophet (sallallaahu ‘alayhi wa sallam) made a treaty with Suhayl Ibn ‘Amr and Abaa Sufyaan Ibn Harb. So the Messenger of Allaah (sallallaahu ‘alayhi wa sallam) said to the Leader of the Believers (‘Alee), “Write O ‘Alee: These are the terms of peace agreed upon by Muhammad the Messenger of Allaah.” So the pagans said, ‘No, by Allaah! Had we known that you were the Messenger of Allaah, we would not have fought you.’ So the Messenger of Allaah (sallallaahu ‘alayhi wa sallam) said, “O Allaah! You know that I am the Messenger of Allaah. Write O ‘Alee: These are the terms of peace agreed upon by Muhammad Ibn ‘Abdullaah.”[7] So by Allaah, the Messenger of Allaah was better than ‘Alee, yet he was not removed from Prophethood when he erased the title from his name.” Stated ‘Abdullaah Ibn ‘Abbaas (radiyallaahu ‘anhumaa), “So two thousand of those people repented, and the rest were killed upon misguidance.”[8]
So in this story, two thousand from amongst the Khawaarij repented from their falsehood, due to clarification and elucidation which emanated from Ibn ‘Abbaas (radiyallaahu ‘anhumaa). So in that is proof that there is in the referring back to the people of knowledge, security from evils and tribulations. Indeed, Allaah the Mighty and Majestic said,
{So ask the people of remembrance if you do not know.}, [Sooratun-Nahl, Aayah 43]
Source: http://salaf-us-saalih.com/2009/07/28/ibn-abbaas-debates-the-khawaarij/