Talhah bin Musarrif said: I asked Abdullah bin Abi Awfa (may Allah be pleased with him): Did the Messenger of Allah (peace and blessings be upon him) make a bequest? He said: No. I said: But the bequest has been prescribed for people, or (he said:) people have been commanded to make a bequest. He said: He (peace and blessings be upon him) enjoined the Book of Allah Almighty.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12552