The Prophet (ﷺ) came visiting me while I was (sick) in Mecca, ('Amir the sub-narrator said, and he
disliked to die in the land, whence he had already migrated). He (i.e. the Prophet) said, "May Allah
bestow His Mercy on Ibn Afra (Sa`d bin Khaula)." I said, "O Allah's Messenger (ﷺ)! May I will all my
property (in charity)?" He said, "No." I said, "Then may I will half of it?" He said, "No". I said, "One
third?" He said: "Yes, one third, yet even one third is too much. It is better for you to leave your
inheritors wealthy than to leave them poor begging others, and whatever you spend for Allah's sake
will be considered as a charitable deed even the handful of food you put in your wife's mouth. Allah
may lengthen your age so that some people may benefit by you, and some others be harmed by you."
At that time Sa`d had only one daughter.
Sahih al-Bukhari Book 55, Hadith 5