﴿ وَأَقْسَمُوا۟ بِٱللَّهِ جَهْدَ أَيْمَٰنِهِمْ لَئِن جَآءَهُمْ نَذِيرٌۭ لَّيَكُونُنَّ أَهْدَىٰ مِنْ إِحْدَى ٱلْأُمَمِ ۖ فَلَمَّا جَآءَهُمْ نَذِيرٌۭ مَّا زَادَهُمْ إِلَّا نُفُورًا ﴾

“As it is, they [who are averse to the truth often] swear by God with their most solemn oaths that if a warner should ever come to them, they would follow his guidance better than any of the communities [of old had followed the warner sent to them]: but now that a warner has come unto them, [his call] but increases their aversion,”

Please check ayah 35:43 for complete tafsir.