Muwatta Imam Malik (Riwayat Yahya)

The mother of Abdur Rahman bin Abi Amrah intended to make a will, but delayed it until morning, and she died during the night. Her intention was to free a slave. Abdur Rahman said: I asked Qasim bin Muhammad: If I free (a slave) on behalf of my mother, will she benefit from it? Qasim said: Sa’d bin Ubadah asked the Messenger of Allah, peace and blessings be upon him, that my mother has died; if I free (a slave) on her behalf, will she benefit from it? The Prophet, peace and blessings be upon him, said: “Yes.”