The heavy emphasis nūn also attaches to the passive imperfect. لَيُوقَيَنَّ means “He certainly will be protected,” whereas لَيَقِيَنَّ means “He certainly will protect.”
Emphatic activeEmphatic passiveContrast
لَيَقِيَنَّلَيُوقَيَنَّprotect / be protected
لَتَقِيَنَّلَتُوقَيَنَّactive / passive second-person or feminine context
The passive stem retains its characteristic vowels and wāw even under emphasis. Emphasis and voice are independent grammatical dimensions.