"O Messenger of Allah, am I to die in the land from which I emigrated?" He said: "No, if Allah wills." He said: "O Messenger of Allah, shall I bequeath all of my wealth in the cause of Allah?" He said: "No." He said: "Two-thirds?" He said: "No." He said: "Half of it?" He said: "No." He said: "One-third of it?" The Messenger of Allah said: "One-third, and one-third is a lot. If you leave your sons independent of means that is better than if you leave them poor, holding out their hands to people."
Sunan an-Nasa'i Book 30, Hadith 20
← Previous Hadith "Sa'd fell sick and the Messenger of Allah entered upon him and he said: 'O Messenger of Allah, shall I bequeath all my money?' He said: 'No.'" And he quoted the same Hadith.

Sunan an-Nasa'i Book 30, Hadith 19 Next Hadith → "The Messenger of Allah visited me when I was sick, and said: 'Have you made a will?' I said: 'Yes.' He said: 'How much?' I said: 'For all my wealth to be given in the cause of Allah.' He said: 'What have you left for your children?' I said: 'They are rich (independent of means).' He said: 'Bequeath one-tenth.' And we kept discussing it until he said: 'Bequeath one-third, and one-third is much or large.'"

Sunan an-Nasa'i Book 30, Hadith 21