Assertion: caliph's position | /r/HasProperty | necessary one
Facets:
Source sentences:
text: The position of imam is a necessary one.
text: As Crone has shown, some of the Kharijites as well as certain Mu tazili theologians were not convinced that the position of a caliph was necessary at all, though this view did not attract much support from the Muslim community.
text: This was so by general consensus, which proves that the position of imam is a necessary one [emphasis added].