"When a person dies, his deeds are cut off except for three: Continuing charity, knowledge that others benefited from, and a righteous son who supplicates for him."
Jami` at-Tirmidhi Book 15, Hadith 57
← Previous Hadith "Umar got some land from Khaibar and said: 'O Messenger of Allah! I got some wealth from Khaibar and I never ever had any wealth as plentiful as it, so what do you order me (to do with it)?' He said: 'If you wish, make it a grant and give charity from it.' So 'Umar gave it in charity: That is not to be sold entirely, nor given away, nor inherited, to be used to produce charity for the needy, those who are near it, for freeing slaves, for the cause of Allah, the wayfarer, the guest, and that there is no harm on its custodian consuming what is customary from it, or eating from its charity, without trying to amass wealth from it."

Jami` at-Tirmidhi Book 15, Hadith 56 Next Hadith → that the Messenger of Allah (ﷺ) said: "The injuries caused by the animal are without liability, and wells are without liability, and mines are without liability, and the Khumus is due on Rikaz."

(Another Chain) from Abu Hurairah, from the Prophet (ﷺ) with similar meaning.

Jami` at-Tirmidhi Book 15, Hadith 58