"Some people passed by an isolated grave with the Messenger of Allah and he led them in prayer and they formed rows behind him." I said: "Who was that O Abu 'Amr?" He said: "Ibn 'Abbas."
Sunan an-Nasa'i Book 21, Hadith 206
← Previous Hadith 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 her then he said: "If anyone among you dies while I am still among you, inform me, for my prayer for his is a mercy."

Sunan an-Nasa'i Book 21, Hadith 205 Next Hadith → "Someone who saw the Prophet pass by an isolated grave told me that he offered the funeral prayer there and his Companions formed rows behind him." It was said: "Who told you this?" He said: "Ibn 'Abbas."

Sunan an-Nasa'i Book 21, Hadith 207