Musannaf Ibn Abi Shaybah 12452 — What follows the deceased after

Amr bin Shu'ayb narrates from his father, from his grandfather, that he asked the Prophet (peace and blessings be upon him): "O Messenger of Allah (peace and blessings be upon him)! Al-As bin Wa'il had ordered in the days of Jahiliyyah that one hundred camels be slaughtered, and Hisham bin al-As slaughtered fifty camels as his share of that. Shall I slaughter on his behalf?" He (peace and blessings be upon him) said: "If your father had affirmed the Oneness of Allah (tawhid), then your fasting on his behalf, giving charity on his behalf and freeing a slave on his behalf would bring him reward."