Sahih Muslim Book - 11, Hadith - 2140

وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ أَخْبَرَنَا شُعْبَةُ عَنْ ثَابِتٍ الْبُنَانِىِّ عَنْ أَنَسِ بْنِ مَالِكٍ أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- أَتَى عَلَى امْرَأَةٍ تَبْكِى عَلَى صَبِىٍّ لَهَا فَقَالَ لَهَا « اتَّقِى اللَّهَ وَاصْبِرِى ». فَقَالَتْ وَمَا تُبَالِى بِمُصِيبَتِى. فَلَمَّا ذَهَبَ قِيلَ لَهَا إِنَّهُ رَسُولُ اللَّهِ -صلى الله عليه وسلم-. فَأَخَذَهَا مِثْلُ الْمَوْتِ فَأَتَتْ بَابَهُ فَلَمْ تَجِدْ عَلَى بَابِهِ بَوَّابِينَ فَقَالَتْ يَا رَسُولَ اللَّهِ لَمْ أَعْرِفْكَ. فَقَالَ « إِنَّمَا الصَّبْرُ عِنْدَ أَوَّلِ صَدْمَةٍ ». أَوْ قَالَ « عِنْدَ أَوَّلِ الصَّدْمَةِ ».

It was narrated from Anas bin Malik that the Messenger of Allah (s.a.w) came to a woman who was crying for a son of hers and said to her: "Have Taqqa of Allah and be patient.' She said: 'What do you know of my affliction?' When he went away, it was said to her: 'That was the Messenger of Allah (s.a.w),' and she was mortally shocked. She came to his door, and did not find any doorkeeper there. She said: 'O Messenger of Allah, I did not recognize you.' He said: 'Patience is when calamity first strikes.'"