Surah Fatir 35:42

وَأَقْسَمُوا۟ بِٱللَّهِ جَهْدَ أَيْمَـٰنِهِمْ لَئِن جَآءَهُمْ نَذِيرٌ لَّيَكُونُنَّ أَهْدَىٰ مِنْ إِحْدَى ٱلْأُمَمِ ۖ فَلَمَّا جَآءَهُمْ نَذِيرٌ مَّا زَادَهُمْ إِلَّا نُفُورًا

And they swore by Allāh their strongest oaths that if a warner came to them, they would be more guided than [any] one of the [previous] nations. But when a warner came to them, it did not increase them except in aversion

Translation: Saheeh International

Tafsir

And they that is the disbelievers of Mecca swore by God their most solemn oaths they swore with utmost effort to be sincere in them that if a warner a messenger were to come to them they would be more readily guided than any one of the communities than the Jews the Christians or others in other words more readily …

Excerpt from Tafsir al-Jalalayn, commentary on 35:42, via Quran.com. The reader has the full commentary and 9 more tafsirs.