Sahih al-Bukhari 4994
Sahih al-Bukhari · Book 66: Virtues of the Qur'an · The compilation of the Qur'an
Narrated `Abdullah bin Mas`ud:
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.
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.