Bukhari

Narrated Ibn `Abbas: I recommend that people reduce the proportion of what they bequeath by will to the fourth (of the whole legacy), for Allah's Apostle said, "One-third, yet even one third is too much."

And Imam Hasan al-Basri (may Allah have mercy on him) said that a bequest of more than one-third of the wealth will not be executed even for a dhimmi disbeliever. Allah the Exalted said in Surah al-Ma'idah «وأن احكم بينهم بما أنزل الله‏»: "Judge between them (even among non-Muslims) according to what Allah has revealed to you."

And Imam Hasan al-Basri (may Allah have mercy on him) said that a bequest of more than one-third of the wealth will not be executed even for a dhimmi disbeliever. Allah the Exalted said in Surah al-Ma'idah «وأن احكم بينهم بما أنزل الله‏»: "Judge between them (even among non-Muslims) according to what Allah has revealed to you."

Narrated Ibn `Abbas: I recommend that people reduce the proportion of what they bequeath by will to the fourth (of the whole legacy), for Allah's Apostle said, "One-third, yet even one third is too much."

Narrated Sa`d: I fell sick and the Prophet paid me a visit. I said to him, "O Allah's Apostle! I invoke Allah that He may not let me expire in the land whence I migrated (i.e. Mecca)." He said, "May Allah give you health and let the people benefit by you." I said, "I want to will my property, and I have only one daughter and I want to will half of my property (to be given in charity)." He said," Half is too much." I said, "Then I will one third." He said, "One-third, yet even one-third is too much." (The narrator added, "So the people started to will one third of their property and that was Permitted for them.")