(16) باب مَنْ قَالَ لَمْ يَتْرُكِ النَّبِيُّ صلى الله عليه وسلم إِلاَّ مَا بَيْنَ الدَّفَّتَيْنِ.
Narrated `Abdul `Aziz bin Rufai':
Shaddad bin Ma'qil and I entered upon Ibn `Abbas. Shaddad bin Ma'qil asked him, "Did the Prophet (ﷺ) leave anything (besides the Qur'an)?" He replied. "He did not leave anything except what is Between the two bindings (of the Qur'an)." Then we visited Muhammad bin Al-Hanafiyya and asked him (the same question). He replied, "The Prophet (ﷺ) did not leave except what is between the bindings (of the Qur'an).
Reference: Sahih al-Bukhari 5019
In-book reference: Book 66, Hadith 41
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 6, Book 61, Hadith 537