In one chain the words are: The Messenger of Allah (peace and blessings be upon him) came to me while I was ill. I said: O Messenger of Allah (peace and blessings be upon him)! Shall I bequeath all my wealth? He (peace and blessings be upon him) said: "No." I said: Two thirds? He (peace and blessings be upon him) said: "No." I said: One third. He (peace and blessings be upon him) remained silent, so the bequest was of a third.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12570