Word by Word Analysis

فَوَرَبِّكَ لَنَحْشُرَنَّهُمْ وَٱلشَّيَـٰطِينَ ثُمَّ لَنُحْضِرَنَّهُمْ حَوْلَ جَهَنَّمَ جِثِيًّا 68

So by your Lord, We will surely gather them and the devils; then We will bring them to be present around Hell upon their knees.