Narrated Anas bin Malik: The Prophet passed by a woman who was weeping beside a grave. He told her to fear Allah and be patient. She said to him,   Go away, for you have not been afflicted with a calamity like mine.   And she did not recognize him. Then she was informed that he was the Prophet . so she went to the house of the Prophet and there she did not find any guard. Then she said to him,   I did not recognize you.   He said,   Verily, the patience is at the first stroke of a calamity.