﴿ إِنَّ ٱلَّذِينَ ءَامَنُوا۟ ثُمَّ كَفَرُوا۟ ثُمَّ ءَامَنُوا۟ ثُمَّ كَفَرُوا۟ ثُمَّ ٱزْدَادُوا۟ كُفْرًۭا لَّمْ يَكُنِ ٱللَّهُ لِيَغْفِرَ لَهُمْ وَلَا لِيَهْدِيَهُمْ سَبِيلًۢا ﴾

“Behold, as for those who come to believe, and then deny the truth, and again come to believe, and again deny the truth, and thereafter grow stubborn in their denial of the truth - God will not forgive them, nor will He guide them in any way.”

As for those who did not believe in Muhammad and the Qur'an, Allah then said: (Lo! those who believe) in Moses, (then disbelieve) after Moses (and then (again) believe) in 'Uzayr, (then disbelieve) after 'Uzayr in Christ, (and then increase in disbelief) and then stay firm in their disbelief in Muhammad and the Qur'an, (Allah will never pardon them) as long as they remain unbelievers, (nor will He guide them unto a way) unto a Religion, rightness or a guided way.