Sufyan bin 'Uyaynah سفيان بن عيينة · The Book of Wills

"It is not befitting for a Muslim to abide for three nights without having his will with him." 'Abdullah bin 'Umar said: "Since I heard this from the Messenger of Allah, I have always had my will with me."

"I became ill with a sickness from which I later recovered. The Messenger of Allah came to visit me, and I said: 'O Messenger of Allah, I have a great deal of wealth and I have no heir except my daughter. Shall I give two-thirds of my wealth in charity?' He said: 'No.' I said: 'Half?' He said: 'No.' I said: 'One-third?' He said: '(Give) one-third, and one-third is a lot. It is better to leave your heirs independent of…

"My father died and left behind wealth, but he did not leave a will. Will it expiate for him if I give charity on his behalf?"

"I said: 'O Messenger of Allah, my mother has died; shall I give in charity on her behalf?' He said: 'Yes.' I said: 'What kind of charity is best?' He said: 'Providing drinking water.'"