It was narrated from ‘Amir bin Sa"d, that his father said that:

The Prophet (ﷺ) came to visit him when he was sick in Makkah, and he did not want to die in the land from which he had migrated. The Prophet (ﷺ) said: “May Allah have mercy on Sa"d bin ‘Afra", may Allah have mercy on Sa"d bin ’Afra"." He [Sa"d] only had one daughter, and he said: O Messenger of Allah, should I bequeath all of my wealth (to charity)? He said: “No." He said: Half of it? He said: "No.” He said: One third? He said: "One third, and one third is a lot. Leaving your heirs independent of means is better than leaving them in need and asking of people by stretching out their hands. Whatever you spend on maintenance is charity, even the morsel you lift to your wife"s mouth. Perhaps Allah will extend your life and benefit some people through you and harm others through you."