Language:
كتاب فضائل القرآن
66  
Virtues of the Qur'an
(8)
Chapter: The Qurra from among the Companions of the Prophet (saws)
(8)
باب الْقُرَّاءِ مِنْ أَصْحَابِ النَّبِيِّ صلى الله عليه وسلم
Sahih al-Bukhari 5000

Narrated Shaqiq bin Salama:

Once `Abdullah bin Mas`ud delivered a sermon before us and said, "By Allah, I learnt over seventy Suras direct from Allah's Messenger (ﷺ) . By Allah, the companions of the Prophet (ﷺ) came to know that I am one of those who know Allah's Book best of all of them, yet I am not the best of them." Shaqiq added: I sat in his religious gathering and I did not hear anybody opposing him (in his speech).

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، حَدَّثَنَا شَقِيقُ بْنُ سَلَمَةَ، قَالَ خَطَبَنَا عَبْدُ اللَّهِ فَقَالَ وَاللَّهِ لَقَدْ أَخَذْتُ مِنْ فِي رَسُولِ اللَّهِ صلى الله عليه وسلم بِضْعًا وَسَبْعِينَ سُورَةً، وَاللَّهِ لَقَدْ عَلِمَ أَصْحَابُ النَّبِيِّ صلى الله عليه وسلم أَنِّي مِنْ أَعْلَمِهِمْ بِكِتَابِ اللَّهِ وَمَا أَنَا بِخَيْرِهِمْ‏.‏ قَالَ شَقِيقٌ فَجَلَسْتُ فِي الْحِلَقِ أَسْمَعُ مَا يَقُولُونَ فَمَا سَمِعْتُ رَادًّا يَقُولُ غَيْرَ ذَلِكَ‏.‏
Reference : Sahih al-Bukhari 5000
In-book reference : Book 66, Hadith 22
USC-MSA web (English) reference : Vol. 6, Book 61, Hadith 522
  (deprecated numbering scheme)