Sahih Bukhari
Wills and Testaments (Wasaayaa)
Volume: 004 / Book Number: 051 / Hadith Number: 3
Narrated Talha bin Musarrif:
I asked 'Abdullah bin Abu Aufa "Did the Prophet make a will?" He replied, "No," I asked him, "How is it then that the making of a will has been enjoined on people, (or that they are ordered to make a will)?" He replied, "The Prophet bequeathed Allah's Book (i.e. Quran)."