"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.'"
Sunan an-Nasa'i Book 30, Hadith 54
← Previous Hadith Sa'd bin 'Ubadah came to the Prophet and said: "My mother has died and she had a vow to fulfill but she did not do so." He said: "Fulfill it on her behalf."

Sunan an-Nasa'i Book 30, Hadith 53 Next Hadith → "I said: 'O Messenger of Allah, what kind of charity is best?' He said: 'Providing drinking water.'"

Sunan an-Nasa'i Book 30, Hadith 55