وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ، أَنَّهُ قَالَ أَتَتِ الْجَدَّتَانِ إِلَى أَبِي بَكْرٍ الصِّدِّيقِ فَأَرَادَ أَنْ يَجْعَلَ السُّدُسَ، لِلَّتِي مِنْ قِبَلِ الأُمِّ فَقَالَ لَهُ رَجُلٌ مِنَ الأَنْصَارِ أَمَا إِنَّكَ تَتْرُكُ الَّتِي لَوْ مَاتَتْ وَهُوَ حَىٌّ كَانَ إِيَّاهَا يَرِثُ فَجَعَلَ أَبُو بَكْرٍ السُّدُسَ بَيْنَهُمَا ‏.‏

Yahya related to me from Malik from Yahya ibn Said that al-Qasimibn Muhammad said, "Two grandmothers came to Abu Bakr asSiddiq, and hewanted to give the sixth to the one who was from the mother's side,and a man of the Ansar said, 'What? Are you omitting the one from whomhe would inherit if she died while he was alive?' Abu Bakr divided thesixth between them.~ Translation Not Available

Book reference: Muwatta Imam Malik Book 27 Hadith 1081
Web reference: Muwatta Imam Malik Book 27 Hadith 5