Yet within this framework he attempted...
Yet within this framework he attempted, again as was to be expected, to correct what he regarded as mistakes of the government, and criticized policies which differed from his viewpoint. The points of difference in religious and political matters between 'Ali on the one hand, and Abu Bakr and 'Umar on the other, are difficult to ascertain because both the Sunni and the Shi'i source materials are extremely tendentious.
The Sunni sources, such as the works of Ibn Sa'd and those who followed him, were written in the period when the recognition of the first four caliphs as the Rashidun was firmly established in the fama'a.
(The English term “orthodoxy”, which is usually used for the central body of the Muslims, is in an Islamic context not only incorrect but misleading; we shall therefore use the Arabic term fama'a for this so-called orthodoxy.) Naturally, every effort was made to show as much agreement as possible, at least between 'Ali, Abu Bakr, and 'Umar.
'Uthman tends to be excluded in religious and political matters, though attempts were nevertheless made to save even 'Uthman's position by blaming the abuses of his caliphate on Marwan, his notorious secretary. On the other hand, the Shi'i sources give a completely different and extreme view of 'Ali's disagreement, not only with 'Uthman, but also with Abu Bakr and 'Umar, on almost every matter, whether religious or political.
In short, according to the Sunni sources, 'Ali was a valued counsellor of the caliphs who preceded him. According to the Shi'i sources, he was the person who, dominated by his heroic love and sense of sacrifice for the faith and disregarding his personal grievances, saved the caliphs from committing the serious mistakes to which they were often prone and which would otherwise have been suicidal for Islam.
'Umar is thus often reported to have said: “Had there not been 'Ali, 'Umar would have perished.” It is very interesting to note that this statement is reported by some of the important early Sunni authors too.[^4] Apart from some of the serious points of disagreementbetween 'Ali and his first two successful rivals, for which there is unanimous historical testimony, as we shall point out below, exactitude in the determination of the mass of this material is probably beyond our reach.