“A grandmother came to Abu Bakr Siddiq and asked him for her inheritance. Abu Bakr said to her: ‘You have nothing according to the Book of Allah, and I don’t know of anything for you according to the Book of Allah, and I don’t know of anything for you according to the Sunnah of the Messenger of Allah ﷺ. Go back until I ask the people.’ So he asked the people and Al-Mughirah bin Shu’bah said: ‘I was present with the Messenger of Allah ﷺ and he gave her (the grandmother) one sixth.’ Abu Bakr said: ‘Is there anyone else with you (who will corroborate what you say)?’ Muhammad bin Maslamah Al-Ansari stood up and said something like what Mughirah bin Shu’bah had said. So Abu Bakr applied it in her case.”  

جَاءَتِ الْجَدَّةُ إِلَى أَبِي بَكْرٍ الصِّدِّيقِ تَسْأَلُهُ مِيرَاثَهَا فَقَالَ لَهَا أَبُو بَكْرٍ مَا لَكِ فِي كِتَابِ اللَّهِ شَىْءٌ وَمَا عَلِمْتُ لَكِ فِي سُنَّةِ رَسُولِ اللَّهِ ﷺ شَيْئًا فَارْجِعِي حَتَّى أَسْأَلَ النَّاسَ فَسَأَلَ النَّاسَ فَقَالَ الْمُغِيرَةُ بْنُ شُعْبَةَ حَضَرْتُ رَسُولَ اللَّهِ ﷺ أَعْطَاهَا السُّدُسَ فَقَالَ أَبُو بَكْرٍ هَلْ مَعَكَ غَيْرُكَ فَقَامَ مُحَمَّدُ بْنُ مَسْلَمَةَ الأَنْصَارِيُّ فَقَالَ مِثْلَ مَا قَالَ الْمُغِيرَةُ بْنُ شُعْبَةَ فَأَنْفَذَهُ لَهَا أَبُو بَكْرٍ ثُمَّ جَاءَتِ الْجَدَّةُ الأُخْرَى مِنْ قِبَلِ الأَبِ إِلَى عُمَرَ تَسْأَلُهُ مِيرَاثَهَا فَقَالَ مَا لَكِ فِي كِتَابِ اللَّهِ شَىْءٌ وَمَا كَانَ الْقَضَاءُ الَّذِي قُضِيَ بِهِ إِلاَّ لِغَيْرِكِ وَمَا أَنَا بِزَائِدٍ فِي الْفَرَائِضِ شَيْئًا وَلَكِنْ هُوَ ذَاكِ السُّدُسُ فَإِنِ اجْتَمَعْتُمَا فِيهِ فَهُوَ بَيْنَكُمَا وَأَيَّتُكُمَا خَلَتْ بِهِ فَهُوَ لَهَا  

It was narrated from Ibn ‘Abbas that the Messenger of Allah ﷺ gave a grandmother one sixth of the inheritance.  

أَنَّ رَسُولَ اللَّهِ ﷺ وَرَّثَ جَدَّةً سُدُسًا