Tafheem-ul-Quran (En) - Al-Fath : 42
وَ اَقْسَمُوْا بِاللّٰهِ جَهْدَ اَیْمَانِهِمْ لَئِنْ جَآءَهُمْ نَذِیْرٌ لَّیَكُوْنُنَّ اَهْدٰى مِنْ اِحْدَى الْاُمَمِ١ۚ فَلَمَّا جَآءَهُمْ نَذِیْرٌ مَّا زَادَهُمْ اِلَّا نُفُوْرَاۙ
These people used to swear on solemn oaths by Allah that if a warner had visited them, they would certainly have been better guided than any other nation in the world. 71 But when a warner did come to them, it increased them in nothing but aversion to the Truth.
71 Before the advent of the Holy Prophet, the same thing used to be said by the Arabs, in general, and by the Quraish, in particular, when they witnessed the moral degeneration of the Jews and the Christians. Mention of this saying of theirs has also been made in Surah Al-An'am :156-157 above, and in Surah AsSaffat: 167-169 below.
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