فَالْفَصْلُ وَاجِبٌ
Then separation is required.
If the first sentence carries a judgment or discourse role that should not extend to the second, coordination can incorrectly project that role onto the latter. Separation is then necessary to protect the intended meaning.
This is especially important when quoted speech is adjacent to a narrator’s statement. An inappropriate conjunction can give the audience the wrong impression about who made the second assertion.
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Faṣl and Waṣl: Definitions, Sentence Coordination, and the Requirement of a Common Link
فَالْفَصْلُ وَاجِبٌ
Then separation is required.
If the first sentence carries a judgment or discourse role that should not extend to the second, coordination can incorrectly project that role onto the latter. Separation is then necessary to protect the intended meaning.
This is especially important when quoted speech is adjacent to a narrator’s statement. An inappropriate conjunction can give the audience the wrong impression about who made the second assertion.