وَأَقۡسَمُواْ بِٱللَّهِ جَهۡدَ أَيۡمَٰنِهِمۡ لَئِن جَآءَهُمۡ نَذِيرٞ لَّيَكُونُنَّ أَهۡدَىٰ مِنۡ إِحۡدَى ٱلۡأُمَمِۖ فَلَمَّا جَآءَهُمۡ نَذِيرٞ مَّا زَادَهُمۡ إِلَّا نُفُورًا ٤٢
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 (English)
Each word's meaning and sound
These denying disbelievers swore a solemn and affirmed oath that if a messenger from Allah came to them to warn them of His punishment, they would be more guided and follow the truth more than the Jews, Christians and others. Yet when Muhammad (peace be upon him) came to them after being sent by His Lord, and he warned them of Allah’s punishment, his coming only increased them in aversion to the truth and adherence to falsehood. They did not fulfil the solemn oaths that they took that they will be more guided than those who preceded them.
Al-Mukhtasar in interpreting the Noble Quran