"After Salat As-Subh, it was said to Ibn 'Abbas that so-and-so - one of the wives of the Prophet ﷺ - has died, so he prostrated. So it was said to him: 'Do you prostrate at this hour?' So he said: 'Has not the Messenger of Allah ﷺ [already] said: 'If you see a sign then prostrate?' Then which sign is grater than the passing of (one of) the wives of the Prophet ﷺ?'"
قِيلَ لاِبْنِ عَبَّاسٍ بَعْدَ صَلاَةِ الصُّبْحِ مَاتَتْ فُلاَنَةُ لِبَعْضِ أَزْوَاجِ النَّبِيِّ ﷺ فَسَجَدَ فَقِيلَ لَهُ أَتَسْجُدُ هَذِهِ السَّاعَةَ فَقَالَ أَلَيْسَ قَدْ قَالَ رَسُولُ اللَّهِ ﷺ إِذَا رَأَيْتُمْ آيَةً فَاسْجُدُوا فَأَىُّ آيَةٍ أَعْظَمُ مِنْ ذَهَابِ أَزْوَاجِ النَّبِيِّ ﷺ