Allaah may forgive any sin that a believer commits except the sin of disbelief (i.e. for the one who does not repent).

 

إِنَّ اللَّهَ لَا يَغْفِرُ أَن يُشْرَكَ بِهِ وَيَغْفِرُ مَا دُونَ ذَٰلِكَ لِمَن يَشَاءُ ۚ وَمَن يُشْرِكْ بِاللَّهِ فَقَدْ ضَلَّ ضَلَالًا بَعِيدًا.

Verily, Allāh forgives not (the sin of) setting up partners (in worship) with Him,  but He forgives whom He wills sins other than that,  and whoever sets up partners in worship with Allāh, has indeed strayed far away.

Surah An-Nisa, verse 116

al-Hilâlî & Muhsin Khân Translation , The Noble Qur'ân