كَأَنَّهُمْ يَوْمَ يَرَوْنَهَا لَمْ يَلْبَثُوٓا۟ إِلَّا عَشِيَّةً أَوْ ضُحَىٰهَا ۝٤٦ Why is the nūn omitted from يَلْبَثُوٓا۟?

Surah An-Nazi‘at — Part 5

• Because it is a perfect verb
• Because لَمْ makes the verb jussive
• Because it is singular
• Because it is passive