وَإِذَا لَقُوا۟ ٱلَّذِينَ ءَامَنُوا۟ قَالُوٓا۟ ءَامَنَّا وَإِذَا خَلَا بَعْضُهُمْ إِلَىٰ بَعْضٍ قَالُوٓا۟ أَتُحَدِّثُونَهُم بِمَا فَتَحَ ٱللَّهُ عَلَيْكُمْ لِيُحَآجُّوكُم بِهِۦ عِندَ رَبِّكُمْ ۚ أَفَلَا تَعْقِلُونَ

And when they meet those who believe, they say, "We have believed"; but when they are alone with one another, they say, "Do you talk to them about what Allāh has revealed to you so they can argue with you about it before your Lord?" Then will you not reason?

Al-Baqarah 76

قُلْ مَن كَانَ عَدُوًّا لِّجِبْرِيلَ فَإِنَّهُۥ نَزَّلَهُۥ عَلَىٰ قَلْبِكَ بِإِذْنِ ٱللَّهِ مُصَدِّقًا لِّمَا بَيْنَ يَدَيْهِ وَهُدًى وَبُشْرَىٰ لِلْمُؤْمِنِينَ

Say, "Whoever is an enemy to Gabriel - it is [none but] he who has brought it [i.e., the Qur’ān] down upon your heart, [O Muḥammad], by permission of Allāh, confirming that which was before it and as guidance and good tidings for the believers."

Al-Baqarah 97

وَلَقَدْ أَنزَلْنَآ إِلَيْكَ ءَايَـٰتٍۭ بَيِّنَـٰتٍ ۖ وَمَا يَكْفُرُ بِهَآ إِلَّا ٱلْفَـٰسِقُونَ

And We have certainly revealed to you verses [which are] clear proofs, and no one would deny them except the defiantly disobedient.

Al-Baqarah 99

وَكَيْفَ تَكْفُرُونَ وَأَنتُمْ تُتْلَىٰ عَلَيْكُمْ ءَايَـٰتُ ٱللَّهِ وَفِيكُمْ رَسُولُهُۥ ۗ وَمَن يَعْتَصِم بِٱللَّهِ فَقَدْ هُدِىَ إِلَىٰ صِرَٰطٍ مُّسْتَقِيمٍ

And how could you disbelieve while to you are being recited the verses of Allāh and among you is His Messenger? And whoever holds firmly to Allāh1 has [indeed] been guided to a straight path.

Ali 'Imran 101

قُلْ يَـٰٓأَهْلَ ٱلْكِتَـٰبِ لَسْتُمْ عَلَىٰ شَىْءٍ حَتَّىٰ تُقِيمُوا۟ ٱلتَّوْرَىٰةَ وَٱلْإِنجِيلَ وَمَآ أُنزِلَ إِلَيْكُم مِّن رَّبِّكُمْ ۗ وَلَيَزِيدَنَّ كَثِيرًا مِّنْهُم مَّآ أُنزِلَ إِلَيْكَ مِن رَّبِّكَ طُغْيَـٰنًا وَكُفْرًا ۖ فَلَا تَأْسَ عَلَى ٱلْقَوْمِ ٱلْكَـٰفِرِينَ

Say, "O People of the Scripture, you are [standing] on nothing until you uphold [the law of] the Torah, the Gospel, and what has been revealed to you from your Lord [i.e., the Qur’ān]." And that which has been revealed to you from your Lord will surely increase many of them in transgression and disbelief. So do not grieve over the disbelieving people.

Al-Ma'idah 68