Sunan Ibn Majah, Chapter: Chapters Regarding Funerals

that Yazid bin Thabit, who was older than Zaid, said: "We went out with The Prophet (saw) and when we reached Al-Baqi', we saw a new grave. He asked about it and they said: '(It is) so-and-so (a woman).' He recognized the name and said: 'Why did you not tell me about her?' They said: 'You were taking a nap and you were fasting, and we did not like to disturb you.' He said: 'Do not do that; I do not want to see it happen again that one of you dies, while I am still among you, and you do not tell me, for my prayer for him is a mercy.' Then he went to the grave and we lined up in rows behind him, and he said four Takbir (i.e. for the funeral prayer)." Sahih