The evidence for the ‘aqīdah must be definite and of unquestionable authenticity. That is why the isolated report (khabar al-ahad) is not fit to be an evidence for ‘aqīdah even if it is a sound hadīth (hadīth Sahih) in its meaning and transmission. As for the Sharī’ah rule, it suffices for its evidence to be speculative (zanni). Therefore, just as the mutawatir hadīth suffices as an evidence for the Sharī’ah rule, likewise the isolated report (khabar al-ahad) suffices as an evidence for the Sharī’ah rule. However, the khabar al-ahad which is suitable to be an evidence for the Sharī’ah rule is the hadīth Sahih and hadīth hasan. As for the weak hadīth (hadīth da'eef) it cannot serve as a Sharī’ah evidence at all. Anyone who educes it he will not be considered to have educed a Sharī’ah evidence. However the consideration of a hadīth as Sahih (sound) or hasan (good) is according to the one who educes it, if he is qualified to understand the hadīth, which may not be so for the rest of the muhadithin. That is because there are transmitters who are trustworthy (thiqa) for some muhadithin but not so for some other muhaddithin, or are considered to be from the obscure (majhul) for some muhaddithin and well known for others. There are ahadīth which are not sound from one line of transmission but are from another and there are lines of transmission which are correct for some but not for others. And there are ahadīth which are not recognised by some muhaddithin and are impugned by them but they are recognised by other muhaddithin who advance them as proof. And there are ahadīth which some of the Ahl al-hadīth discredited but fuqaha in general accepted them and used then a proof. People's adherence to the consideration of a hadīth as Sahih or hasan according to a particular opinion or all of the opinions constitutes an incorrect adherence and contradicts the reality of the hadīth. Nor is it allowed to hastily accept a hadīth without due consideration to its authenticity, likewise it is not allowed to hastily discredit a hadīth and reject it merely because one of the muhaddithin has questioned the probity of a transmitter due to the possibility that it might be acceptable with another transmitter. And one should not reject a hadīth purely because one muhaddith has rejected it because of the possibility that it might be accepted by another muhaddith or reject it because the muhaddithin (in general) have rejected it because of the possibility that it might have been used as proof by the imams and general body of fuqaha (jurists). One should not be rash in discrediting or rejecting a hadīth except if its transmitter is known by all to be disparaged or the hadīth is rejected by everyone or no one advanced it as a proof except some of the fuqaha who lacked knowledge of the hadīth. It is then that the hadīth is discredited and rejected. One should be careful and give it thought before one calls a hadīth into question or reject it. Anyone who scrutinises the transmitters and and ahadīth he will find many differences regarding them between the muhaddithin. And the examples are many. For example: Abu Dawud narrated on the authority of 'Amr ibn Shu'ayb who narrated from his father, who narrated from his grandfather that the Messenger of Allah  said: