Start from the Mudhaari' form, place the prohibitive particle before it, then apply Jazm.
ResultStep
تَنْصُرُstart from Mudhaari'
لَا تَنْصُرْadd prohibitive Laa + apply Jazm
Core rule: prohibitive Laa + Mudhaari' in Jazm.
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How to Form the Prohibitive
The Prohibitive Verb (Fi'l Nahi) - Concept & Construction
Start from the Mudhaari' form, place the prohibitive particle before it, then apply Jazm.
ResultStep
تَنْصُرُstart from Mudhaari'
لَا تَنْصُرْadd prohibitive Laa + apply Jazm
Core rule: prohibitive Laa + Mudhaari' in Jazm.