Shar bin Hushab al-Asha'ri شهر بن حوشب الأشعري · The Book of Wills

"O Messenger of Allah, shall I bequeath two-thirds of my wealth?" He said: "No." He said: "Shall I bequeath half?" He said: "No." He said: "Shall I bequeath one-third?" He said: "Yes, one-third, and one-third is much or large. If you leave your heirs independent of means that is better than if you leave them poor, holding out their hands."

"If the people were to reduce (their bequests) to one-quarter (of their wealth, that would be better), because the Messenger of Allah said: 'One-third, and one-third is much or large.'"