Once the Quran came to be deemed not self-sufficient and the need was felt to supplement it with hadiths and ijtihads, the rise of numerous sects was inevitable. The four sects prevalent today of the Sunni and Shii sects have had the largest followers among many that have emerged in history.
According to one hadith a man’s calf should be covered, according to another it might be uncovered; according to a commentary of a hadith bleeding would render a man canonically unclean, according to another, touching a woman’s hand would have the same effect. Those who were responsible for corrupting religion by reverting to sources other than the Quran tried to come to a settlement of such issues by having recourse to sects. In this way, the Islam of the Quran was transformed to the Islam of the sectarians. On the other hand, it so happened that the founder of a sect took into his head to enjoin the covering of a man’s body from the waist down to his knees based on a certain hadith, while another denied the authenticity of it. The founder of another sect thinks otherwise and disregards such a prohibition. The fact is that a given hadith was liable to be interpreted differently, but not the Quran since it is the unique source of Islam.