Virtues of the Qur'an
حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي إِسْحَاقَ، قَالَ سَمِعْتُ عَبْدَ الرَّحْمَنِ بْنَ يَزِيدَ، سَمِعْتُ ابْنَ مَسْعُودٍ، يَقُولُ فِي بَنِي إِسْرَائِيلَ وَالْكَهْفِ وَمَرْيَمَ وَطَهَ وَالأَنْبِيَاءِ إِنَّهُنَّ مِنَ الْعِتَاقِ الأُوَلِ وَهُنَّ مِنْ تِلاَدِي.Narrated `Abdullah bin Mas`ud:Surat Bani-lsrael, Al-Kahf (The Cave), Maryam, Taha, Al-Anbiya' (The prophets) are amongst my first earnings and my old property, and (in fact) they are my old property
From Sahih al-Bukhari, whose reports the scholars accept as authentic.