21 Preface فَكَيفَ كانَ عَذابي وَنُذُرِYusuf AliYea, how (terrible) was My Penalty and My Warning!1Repeated from verse 18 to heighten the description of the sin, the penalty, and the criminal negligence of the sinners in refusing the warnings on account of their self-complacent confidence in their own strength and stability! It is repeated again as a secondary refrain in 54:30 and (with slight modification) in 54:37 and 39.