﴿ 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,”

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 guided than any one of these — having themselves seen the extent to which these groups called each other liars given that The Jews say ‘The Christians stand on nothing’ and the Christians say ‘The Jews stand on nothing’ Q. 2113. But when a warner namely Muhammad (s) did come to them this coming of his only increased them in aversion further away from right guidance