Musannaf Ibn Abi Shaybah 38876 — Praying on behalf of the deceased

It is reported from Sayyiduna Abu Hurayrah, Zayd bin Khalid and Shibl (may Allah be pleased with them) that they were present with the Prophet (peace and blessings be upon him). A man stood up and said: "I adjure you by Allah to judge between us according to the Book of Allah." (Then) the man's opponent, who seemed more understanding than the first, said: "Judge between us by the Book of Allah, and grant me permission to speak." He said: "Speak!" The man said: "My son was employed by this man, and he committed zina with his wife. So I gave one hundred sheep and a servant as ransom for him. Then I asked people of knowledge, and I was told that my son is liable to a punishment of one hundred lashes and exile for one year, and that his wife is liable to the ruling of stoning." the Prophet (peace and blessings be upon him) said: "By the One in whose hand my soul is, I will certainly judge between you by the Book of Allah. The one hundred sheep and the servant are to be returned to you, and your son is liable to the punishment of one hundred lashes and exile for one year. And (he said) O Unays, go to this man's wife, and if she confesses, stone her."