لَمَّا قُتِلَ جَعْفَرُ بْنُ أَبِي طَالِبٍ ع أَمَرَ رَسُولُ اللَّهِ ص فَاطِمَةَ ع أَنْ تَتَّخِذَ طَعَاماً- لِأَسْمَاءَ بِنْتِ عُمَيْسٍ ثَلَاثَةَ أَيَّامٍ وَ تَأْتِيَهَا وَ نِسَاءَهَا فَتُقِيمَ عِنْدَهَا ثَلَاثَةَ أَيَّامٍ فَجَرَتْ بِذَلِكَ السُّنَّةُ أَنْ يُصْنَعَ لِأَهْلِ الْمُصِيبَةِ طَعَامٌ ثَلَاثاً.
“Abu ’Abd Allah (a.s.), has said that when Ja‘far ibn abu Talib was martyred, the Messenger of Allah instructed Fatimah, ‘Alayha al-Salam, to prepare food for Asma’ bint ‘Umays for three days and visit her with a group of her women everyday for three days. This formed the tradition to prepare food for the people of the