Fatimah was demanding (the property of) sadaqah of the Messenger of Allah ﷺ at Medina and Fadak, and what remained from the fifth of Khaybar. Aisha quoted AbuBakr as saying: The Messenger of Allah ﷺ said: We are not inherited; whatever we leave is sadaqah. The family of Muhammad will eat from this property, that is, from the property of Allah. They will not take more then their sustenance.
أَنَّ عَائِشَةَ زَوْجَ النَّبِيِّ ﷺ أَخْبَرَتْهُ بِهَذَا الْحَدِيثِ قَالَ وَفَاطِمَةُ عَلَيْهَا السَّلاَمُ حِينَئِذٍ تَطْلُبُ صَدَقَةَ رَسُولِ اللَّهِ ﷺ الَّتِي بِالْمَدِينَةِ وَفَدَكَ وَمَا بَقِيَ مِنْ خُمُسِ خَيْبَرَ قَالَتْ عَائِشَةُ ؓ فَقَالَ أَبُو بَكْرٍ ؓ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ نُورَثُ مَا تَرَكْنَا صَدَقَةٌ وَإِنَّمَا يَأْكُلُ آلُ مُحَمَّدٍ فِي هَذَا الْمَالِ يَعْنِي مَالَ اللَّهِ لَيْسَ لَهُمْ أَنْ يَزِيدُوا عَلَى الْمَأْكَلِ