Musnad Abu Ya'la al-Mawsili 117:230

Zuhayr narrated to us, Abd al-Samad narrated to us, Shu'bah narrated to us, Thabit narrated to us, he said: I heard Anas ibn Malik saying to a woman of his family: "Do you not know so-and-so? For the Messenger of Allah (peace and blessings of Allah be upon him) passed by her while she was weeping over a grave, and he said to her: 'Fear Allah and be patient.'" She said to him: "Leave me alone, for you are not afflicted with my calamity." She did not know him. It was said to her: "This is the Messenger of Allah." She was seized by something like death, and she came to his door, and she did not find a doorkeeper at it. She said: "O Messenger of Allah, I did not know you." He said: "Verily, patience is at the first shock."