اَفَمَنْ زُيِّنَ لَهٗ سُوْۤءُ عَمَلِهٖ فَرَاٰهُ حَسَنًاۗ فَاِنَّ اللّٰهَ يُضِلُّ مَنْ يَّشَاۤءُ وَيَهْدِيْ مَنْ يَّشَاۤءُۖ فَلَا تَذْهَبْ نَفْسُكَ عَلَيْهِمْ حَسَرٰتٍۗ اِنَّ اللّٰهَ عَلِيْمٌ ۢبِمَا يَصْنَعُوْنَ ( فاطر: ٨ )
Afaman zuyyina lahoo sooo'u 'amalihee fara aahu hasanaa; fa innal laaha yudillu mai yashaaa'u wa yahdee mai yahaaa'u falaa tazhab nafsuka 'alaihim hasaraat; innal laaha 'aleemun bimaa yasna'oon (Fāṭir 35:8)
Sahih International:
Then is one to whom the evil of his deed has been made attractive so he considers it good [like one rightly guided]? For indeed, Allah sends astray whom He wills and guides whom He wills. So do not let yourself perish over them in regret. Indeed, Allah is Knowing of what they do. (Fatir [35] : 8)
1 Mufti Taqi Usmani
Then, can the one whose evil deed is so much adorned for him that he deems it really good (be equal to the one who differentiates between good and evil)? The fact, therefore, is that Allah lets go astray whomsoever He wills, and leads to the right path whomsoever He wills. So, (O Prophet,) let not your soul collapse in grief for them. Surely Allah knows well what they are doing.