PatternExampleAnalysis
Affirmation/negationyaʿlamūn / lā yaʿlamūnKnowledge affirmed and denied in distinct respects
Command/prohibitionikhshawn / lā takhshawProper and improper directions of fear
In each, the relevant object of the predicate must be distinguished. These pairs create rhetorical antithesis, but they must not be read as asserting and denying the same statement in exactly the same respect.
Their rhetorical strength is the concise arrangement of two opposing directives or assessments.