2:6
إِنَّ ٱلَّذِينَ كَفَرُوا۟ سَوَآءٌ عَلَيْهِمْ ءَأَنذَرْتَهُمْ أَمْ لَمْ تُنذِرْهُمْ لَا يُؤْمِنُونَ
Indeed, those who disbelieve - it is all the same for them whether you warn them or do not warn them - they will not believe.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
Allah said,
إِنَّ الَّذِينَ كَفَرُواْ
(Verily, those who disbelieve) meaning, covered the truth and hid it. Since Allah has written that they would do so, it does not matter if you (O Muhammad ) warn them or not, they would still have disbelieved in what you were sent with. Similarly, Allah said,
إِنَّ الَّذِينَ حَقَّتْ عَلَيْهِمْ كَلِمَةُ رَبِّكَ لاَ يُؤْمِنُونَ - وَلَوْ جَآءَتْهُمْ كُلُّ ءايَةٍ حَتَّى يَرَوُاْ الْعَذَابَ الاٌّلِيمَ
(Truly, those against whom the Word (wrath) of your Lord has been justified, will not believe. Even if every sign should come to them, until they see the painful torment) (10:96-97).
About the rebellious People of the Book, Allah said,