Sunan An-Nasa'i
Hadith #3632
It was narrated from Sa'd that the Prophet visited him when he was sick, and he said:""O Messenger of Allah, shall I bequeath all of my wealth?"" He said: ""No."" He said: ""Half?"" He said: ""No."" He said: ""One-third?"" He said: ""One-third, and one-third is much or large