Harun bin Ishaq bin Muhammad هارون بن إسحاق بن محمد بن مالك · The Book of Funerals

"Whoever follows the funeral of a Muslim man, seeking reward, and offers the prayer and buries him, will have two Qirats. And whoever offers the funeral prayer then goes back before the burial, then he returns with one Qirat of reward."

they went out with the Messenger of Allah one day and he saw a new grave. He said: "What is this?" They said: "This is so-and-so, the freed slave woman of Banu so-and-so" - whom Messenger of Allah knew - "She died at midday and we did not like to wake you up when you were fasting and taking a nap." The Messenger of Allah stood (for prayer) and the people formed rows behind him. He said four Takbirs over…