When running through some of the different groups that existed among the Shi’ah after the death of the 11th Imam [AS] in the apparent absence of any physical offspring there were also the Qat’iyyah who stand at opposite extremes to the la adriyyah those people who contented themselves in saying we do not know what happened. The Qat’iyyah are those by contrast who are certain, Qat’iyyah meaning ‘those who profess certainty’.
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