﴿ إِلَّا عِبَادَ ٱللَّهِ ٱلْمُخْلَصِينَ ﴾

“excepting only [those who were] God’s true servants;”

(Save single minded slaves of Allah) save the salves of Allah who are sincere in their worship and have faith in Allah's divine Oneness; these will not be tormented.