Musnad Ahmad Hadith 19452

It is narrated from Yazid bin Thabit (may Allah be pleased with him) that once we went out with the Noble Prophet (ﷺ) and reached Jannat al-Baqi‘, where we saw a new grave. The Prophet asked, "Whose grave is this?" The people informed him that it was the grave of such-and-such woman. The Noble Prophet (ﷺ) recognized her and said, "Why did you not inform me about her?" The people replied, "O Messenger of Allah (ﷺ)! You were fasting and resting at midday, so we did not consider it appropriate to disturb you." The Noble Prophet (ﷺ) said, "Do not do so. As long as I am among you, be sure to inform me about anyone who passes away among you, for my offering the funeral prayer for them is a mercy for them." Then the Noble Prophet (ﷺ) approached her grave, we formed rows behind him, and the Noble Prophet (ﷺ) said four takbirs over her.