Surah Al-Imran, ayah 90

3:90

إِنَّ ٱلَّذِينَ كَفَرُواْ بَعۡدَ إِيمَٰنِهِمۡ ثُمَّ ٱزۡدَادُواْ كُفۡرٗا لَّن تُقۡبَلَ تَوۡبَتُهُمۡ وَأُوْلَٰٓئِكَ هُمُ ٱلضَّآلُّونَ ٩٠

Innal-ladhīna kafarū ba'da īmānihim thummazdādū kufral lan tuqbala tawbatuhum wa ulā'ika humud-dāllūn

Indeed, those who disbelieve [i.e., reject the message] after their belief and then increase in disbelief - never will their [claimed] repentance be accepted, and they are the ones astray.