Bukhari Collection: ::Book Number 4:: Hadith # 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. Qur'an).