Surah Aal-i-Imraan, Verse 90
إِنَّ ٱلَّذِينَ كَفَرُوا۟ بَعْدَ إِيمَٰنِهِمْ ثُمَّ ٱزْدَادُوا۟ كُفْرًۭا لَّن تُقْبَلَ تَوْبَتُهُمْ وَأُو۟لَٰٓئِكَ هُمُ ٱلضَّآلُّونَ
Translation — Sahih International
Indeed, those who reject the message after their belief and then increase in disbelief - never will their [claimed] repentance be accepted, and they are the ones astray.
Source
Kur'an-ı Kerim, Âl-i İmrân Suresi 3:90
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/3-suresi-90-ayet