27فَلَنُذيقَنَّ الَّذينَ كَفَروا عَذابًا شَديدًا وَلَنَجزِيَنَّهُم أَسوَأَ الَّذي كانوا يَعمَلونَAli UnalBut We will certainly make those who disbelieve taste a severe punishment, and certainly recompense them for the worst of what they keep doing.1The worst of what the unbelievers do is certainly unbelief; so first of all, God will punish them for unbelief. The verse aims to strongly discourage the unbelievers.