Surah Ya-Sin 36:10

وَسَوَآءٌ عَلَيْهِمْ ءَأَنذَرْتَهُمْ أَمْ لَمْ تُنذِرْهُمْ لَا يُؤْمِنُونَ

And it is all the same for them whether you warn them or do not warn them - they will not believe.

Translation: Saheeh International

Tafsir

And it is the same to them whether you warn them read a-andhartuhum pronouncing both hamzas; or by substituting an alif for the second one; or by not pronouncing the second one but inserting an alif between the one not pronounced and the other one or without the insertion or do not warn them they will not believe.

Excerpt from Tafsir al-Jalalayn, commentary on 36:10, via Quran.com. The reader has the full commentary and 9 more tafsirs.