مَا شَاعِرٌ إِلَّا زَيْدٌ
The poet is Zayd, not ʿAmr.
If the listener believes ʿAmr is the poet and Zayd is not, the same construction reverses that attribution and makes Zayd the exclusive holder of the quality. This is qalb.
The earlier mistake is a swapped identification, not an imagined joint possession. A change in the listener’s prior assertion therefore changes the classification even though the utterance remains the same.
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Qasr: Definitions, Real and Relative Restriction, and Ifrād, Qalb and Taʿyīn
مَا شَاعِرٌ إِلَّا زَيْدٌ
The poet is Zayd, not ʿAmr.
If the listener believes ʿAmr is the poet and Zayd is not, the same construction reverses that attribution and makes Zayd the exclusive holder of the quality. This is qalb.
The earlier mistake is a swapped identification, not an imagined joint possession. A change in the listener’s prior assertion therefore changes the classification even though the utterance remains the same.