Lā taktubanna ʿalā al-jidār: prohibition with direct heavy nūn; the present verb is built on fatḥ and occupies the jussive slot governed by lā.
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Emphatic Nūn in Prohibition
The Two Emphatic Nūns: Forms and Rules
Lā taktubanna ʿalā al-jidār: prohibition with direct heavy nūn; the present verb is built on fatḥ and occupies the jussive slot governed by lā.