Lā in “do not lie” is prohibitive, not additional. The second lā in “neither Zayd nor Khālid came to me” may be analyzed as reinforcement of an existing negation.
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Core Versus Additional Functions
Additional Particles: Seven Forms, Emphasis and Syntactic Case
Lā in “do not lie” is prohibitive, not additional. The second lā in “neither Zayd nor Khālid came to me” may be analyzed as reinforcement of an existing negation.