إِنَّ ٱلْأَبْرَارَ لَفِى نَعِيمٍۢ
Sentence structure
إِنَّ makes ٱلْأَبْرَارَ accusative as its noun. The emphatic prepositional phrase لَفِى نَعِيمٍ is its predicate.
Ayah summary
The righteous will remain in Paradise in lasting blessing and comfort.
إِنَّ — Indeed
Grammar: an accusative/emphatic particle.
ٱلْأَبْرَارَ — the righteous
Grammar: A definite accusative noun functioning as the noun of إِنَّ.
لَفِى — (will be) surely in
Grammar: لَ is the displaced emphatic lām and فِى a preposition; the phrase forms the predicate of إِنَّ.
نَعِيمٍۢ — bliss
Grammar: An indefinite genitive noun governed by فِى.