وَيُوصَفُ بِهَا الْمُتَكَلِّمُ أَيْضًا
A speaker too may be described as fasih.
كَاتِبٌ فَصِيحٌ وَشَاعِرٌ فَصِيحٌ
A fasih writer and a fasih poet.
Here the attribute belongs to the person, not merely one utterance. Producing one fasih sentence and possessing a reliable capacity to produce fasih discourse are related, but not identical.
The evaluation concerns the person's expressive ability rather than implying that every word spoken on every occasion must be flawless.
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Fasaha and Balagha: Linguistic Meanings, Divisions, and Word-level Foundations
وَيُوصَفُ بِهَا الْمُتَكَلِّمُ أَيْضًا
A speaker too may be described as fasih.
كَاتِبٌ فَصِيحٌ وَشَاعِرٌ فَصِيحٌ
A fasih writer and a fasih poet.
Here the attribute belongs to the person, not merely one utterance. Producing one fasih sentence and possessing a reliable capacity to produce fasih discourse are related, but not identical.
The evaluation concerns the person's expressive ability rather than implying that every word spoken on every occasion must be flawless.