due to the fact that in each utterance of everyone of them there can be found benefits that cannot be seen in that of the other, and their evidences altogether can convince men of thought and opinion (with truth), so that no dispute can be there but only by the ignorant and bigoted.
There were several other cults and groups who took various positions toward hadith, like the Shi'ah, Zaydis, Kharijites (Khawarij) and others, as every people have their own sunnah and their own leader (imam).
In regard of the Shi'ah, in particular the Imamiyyah, they never approve but only the traditions that proved to be correct in their view, through the way of Ahl al-Bayt from their grandfather (S). That means, they accept only those traditions reported by al-Sadiq (Ja'far), from his father al-Baqir, from his father Zayn al-Abidin, from al-Husayn al-Sibt, from his father Amir al-Mu'minin, from the Messenger of Allah, (God's peace be upon them all. Whereas the traditions reported by people like Abu Hurayrah, Samurah ibn Jundub, Marwan ibn al-Hakam, Imran ibn Hittan, and Amr ibn al-As and their likes, have no consideration even an atom in their view.712
Concerning the Khawarij,713 they used to take and adopt only those traditions reported by the Sahabah followed by them. So the traditions accepted and deemed authentic by them being only those which were propagated to people before the fitnah (disorder, sedition),714 white after it they have disregarded all the Jumhur due to their following of the imams of tyranny as they claimed as a result of which they could not attain their trust.
Opinion of al-Imam Muhammad Abduh:
Hadith al-ahad, whatever degree of veracity it attained with the traditionists, was rejected and disapproved alright by al-Imam Muhammad Abduh, when it be contradictory to and disagreeing with reason, Qur'an and knowledge. The following are some excerpts of his sayings in this regard.712. Al-Allamah Muhammad Husayn Al-Kashif al-Ghita', Asl al-Shi'ah wa usuluha, p.149, 10th edition.
713. They are those who renounced allegiance and revolted against Ali (A).
714. How is it possible to distinguish between what was producted before the fitnah and what was produced after it.