because the Muslims were preoccupied with one another(1). This amounts to omitting mention of the leaders(2) of the complete and perfect caliphate and restricting mention to the caliphate that was never completed and whose purpose was not fulfilled.
This was [among](3) the arguments of those who named Muʿāwiyah [—may Allah be pleased with him—](4) as the fourth while not mentioning Ali, may Allah be pleased with him, as was the practice of those who [used to](5) do so in al-Andalus and elsewhere. They said(6): “This is because the Muslims agreed upon Muʿāwiyah [—may Allah be pleased with him—](7), unlike Ali [—may Allah be pleased with him—](8).” There is no doubt that, although their position was mistaken, the position of those who mention Ali alone is an even greater error than theirs.
More serious than all of that(9) is mentioning the Twelve in his sermons or elsewhere, inscribing their names upon a wall, or reciting their names as a prompt to a deceased person. This is the reprehensible innovation which is necessarily known(10) from the religion of Islam to be(11) among the gravest matters ever introduced into Islam. If the preacher were to omit mention of all four altogether(12), no objection would be raised against him. What is objectionable is restricting mention