﴿ فَٱصْبِرْ إِنَّ وَعْدَ ٱللَّهِ حَقٌّۭ ۚ فَإِمَّا نُرِيَنَّكَ بَعْضَ ٱلَّذِى نَعِدُهُمْ أَوْ نَتَوَفَّيَنَّكَ فَإِلَيْنَا يُرْجَعُونَ ﴾

“HENCE, remain thou patient in adversity - for, verily, God’s promise always comes true. And whether We show thee [in this world] something of what We hold in store for those [deniers of the truth], or whether We cause thee to die [ere that retribution takes place - know that, in the end], it is unto Us that they will be brought back.”

So be patient. Assuredly God’s promise to chastise them is true. And if We show you fa-immā contains an assimilated conditional particle in; the mā is extra and emphasises the conditional import at the beginning of the verb while the nūn emphasises it at the end a part of what We promise them of chastisement in your lifetime the response to the conditional has been omitted in other words it is something like ‘then so be it!’ … or We take you unto Us in death before their chastisement then in any case to Us they will be returned whereupon We shall chastise them with the most severe punishment this last mentioned response is that of the supplement only.