The Messenger of Allah (ﷺ) as saying: When a man dies, his action discontinues from him except three things, namely, perpetual sadaqah (charity), or the knowledge by which benefit is acquired, or a pious child who prays for him.
Sunan Abi Dawud Book 18, Hadith 19
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'Abd al-Hamid b. Abd 'Allah b. 'Abd Allah b. 'Umar b. al-Khattab copied to me a document about the religious endowment (waqf) made by 'Umar b. al-Khattab : In the name of Allah, the Compassionate, the Merciful. This is what Allah's servant 'Umar has written about Thamgh. He narrated the tradition like the one transmitted by Nafi'. He added: "provided he is not storing up goods (for himself)". The surplus fruit will be devoted to the beggar and the deprived. He then went on with the tradition, saying: If the man in charge of Thamgh wishes to buy a slave for his work for its fruits (by selling them), he may do so. Mu'iqib penned it and 'Abd Allah b. al-Arqam witnessed it : In the name of Allah, the Compassionate, the Merciful. This is what Allah's servant 'Umar , Commander of Faithful, directed, in case of some incident happens to him (i.e. he dies), that Thamg, Sirmah b. al-Akwa', the servant who is there, the hundred shares in (the land of) Khaibr, the servant who is there and the hundred sahres which Muhammad (ﷺ) had donated to me in the valley (nearly) will remain in the custody of Hafsah during her life, then the men of opinion from her family will be in charge of these (endowments), that these will neither be sold not purchased, spending (its produce) where they think (necessary on the beggar, deprived and relatives). There is no harm to the one in charge (of this endowment) if he eats himself, or feeds, or buys slaves with it.
Sunan Abi Dawud Book 18, Hadith 18 Next Hadith → A woman said: Messenger of Allah, my mother suddenly died; if it had not happened, she would have given sadaqah (charity) and donated (something). Will it suffice if I give sadaqah on her behalf? The Prophet (ﷺ) said: Yes, give sadaqah on her behalf.
Sunan Abi Dawud Book 18, Hadith 20
Sunan Abi Dawud Book 18, Hadith 18 Next Hadith → A woman said: Messenger of Allah, my mother suddenly died; if it had not happened, she would have given sadaqah (charity) and donated (something). Will it suffice if I give sadaqah on her behalf? The Prophet (ﷺ) said: Yes, give sadaqah on her behalf.
Sunan Abi Dawud Book 18, Hadith 20