Shaddad bin Ma'qil and I entered upon Ibn `Abbas. Shaddad bin Ma'qil asked him, "Did the Prophet (ﷺ) leave anything (besides the Quran)?" He replied. "He did not leave anything except what is Between the two bindings (of the Quran)." 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 Quran).
Sahih al-Bukhari Book 66, Hadith 41