﴿ فَيُعَذِّبُهُ ٱللَّهُ ٱلْعَذَابَ ٱلْأَكْبَرَ ﴾

“him will God cause to suffer the greatest suffering [in the life to come]:”

God will chastise him with the greater chastisement the chastisement of the Hereafter the lesser chastisement being that of this world that of being killed or taken captive.