فَلَوso if أَنَّthat مَحموماًa fever-stricken man بِخَيبَرَin Khaybar مُدنَفاًgravely ill
فَلَو أَنَّ مَحموماً بِخَيبَرَ مُدنَفاً
تَنَشَّقَinhaled رَيّاهاits fragrance لَأَقلَعَwould surely abate صالِبُهhis burning fever
تَنَشَّقَ رَيّاها لَأَقلَعَ صالِبُه
So if a fever-stricken man in Khaybar, gravely ill,
inhaled its fragrance, his burning fever would surely abate.