The cited Qurʾānic clause (Yūsuf 12:85) is conventionally analyzed with an understood negative lā before taftaʾu in the persistence sense.
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Understood Negation: Literary Usage
Defective Verbs: Kāna and Its Sisters
The cited Qurʾānic clause (Yūsuf 12:85) is conventionally analyzed with an understood negative lā before taftaʾu in the persistence sense.