The phrase thalāthata qurūʾ combines two distinct issues. Thalāthata determinately means three, not two. What jurists discuss is which sort of periods qurūʾ denotes.
Number: three.
Units counted: menstrual periods or periods of purity.
Legal-method lesson: one part of a text may be unambiguous while another part raises a genuine lexical question. It would be mistaken to transfer uncertainty about the noun to the number itself.
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Mushtarak and Muʾawwal: Multiple Meanings, Preference and Legal Force
The phrase thalāthata qurūʾ combines two distinct issues. Thalāthata determinately means three, not two. What jurists discuss is which sort of periods qurūʾ denotes.
Number: three.
Units counted: menstrual periods or periods of purity.
Legal-method lesson: one part of a text may be unambiguous while another part raises a genuine lexical question. It would be mistaken to transfer uncertainty about the noun to the number itself.