حَدَّثَنَا مُحَمَّدُ بْنُ عُثْمَانَ بْنِ أَبِي صَفْوَانَ الثَّقَفِيُّ، حَدَّثَنَا يَحْيَى بْنُ كَثِيرٍ، حَدَّثَنَا سَلْمُ بْنُ جَعْفَرٍ، عَنِ الْحَكَمِ بْنِ أَبَانَ، عَنْ عِكْرِمَةَ، قَالَ قِيلَ لاِبْنِ عَبَّاسٍ مَاتَتْ فُلاَنَةُ بَعْضُ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم فَخَرَّ سَاجِدًا فَقِيلَ لَهُ أَتَسْجُدُ هَذِهِ السَّاعَةَ فَقَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏إِذَا رَأَيْتُمْ آيَةً فَاسْجُدُوا ‏"‏ ‏.‏ وَأَىُّ آيَةٍ أَعْظَمُ مِنْ ذَهَابِ أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم

Ikrimah said

It was said to Ibn Abbas: "So-and-so, one of the wives of the Prophet, may Allah bless him and grant him peace, has died." So he fell down prostrating. It was said to him: "Do you prostrate at this hour?" He said: "The Messenger of Allah, may Allah bless him and grant him peace, said: 'When you see a sign, prostrate.' And what sign is greater than the passing away of the wives of the Prophet, may Allah bless him and grant him peace?"