﴿ إِنَّ ٱلَّذِينَ لَا يُؤْمِنُونَ بِـَٔايَٰتِ ٱللَّهِ لَا يَهْدِيهِمُ ٱللَّهُ وَلَهُمْ عَذَابٌ أَلِيمٌ ﴾

“Verily, as for those who will not believe in God's messages, God does not guide them aright; and grievous suffering will be their lot [in the life to come].”

(Lo! those who disbelieve the revelations of Allah) i.e. Muhammad (pbuh) and the Qur'an, (Allah guideth them not) to His religion, i.e. He does not guide those who do not deserve to be guided; it is also said that this means: He does not guide them to the right proof nor save them from the Fire (and theirs will be a painful doom) a severe chastisement.