Lā tuḥmilanna wājibaka: prohibitive lā governs the jussive position; the nūn-attached verb is formally built on fatḥ. Wājibaka is its direct object.
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Full Parsing with Prohibition
The Two Emphatic Nūns: Forms and Rules
Lā tuḥmilanna wājibaka: prohibitive lā governs the jussive position; the nūn-attached verb is formally built on fatḥ. Wājibaka is its direct object.