From Sahih Bukhari (Hadith 2740):
Narrated Talha bin Musarrif:I asked `Abdullah bin Abu `Aufa "Did the Prophet (ﷺ) 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 (ﷺ) bequeathed Allah's Book (i.e. Qur'an)
Reference: Bukhari 2740