Narrated Huzail bin Shirahbil:Abu Musa was asked regarding (the inheritance of) a daughter, a son's daughter, and a sister. He said, "The daughter will take one-half and the sister will take one-half. If you go to Ibn Mas`ud, he will tell you the same." Ibn Mas`ud was asked and was told of Abu Musa's verdict. Ibn Mas`ud then said, "If I give the same verdict, I would stray and would not be of the rightly-guided. The verdict I will give in this case, will be the same as the Prophet (ﷺ) did, i.e. one-half is for daughter, and one-sixth for the son's daughter, i.e. both shares make two-thirds of the total property; and the rest is for the sister." Afterwards we cams to Abu Musa and informed him of Ibn Mas`ud's verdict, whereupon he said, "So, do not ask me for verdicts, as long as this learned man is among you."
حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا أَبُو قَيْسٍ، سَمِعْتُ هُزَيْلَ بْنَ شُرَحْبِيلَ، قَالَ سُئِلَ أَبُو مُوسَى عَنِ ابْنَةٍ وَابْنَةِ ابْنٍ وَأُخْتٍ، فَقَالَ لِلاِبْنَةِ النِّصْفُ وَلِلأُخْتِ النِّصْفُ، وَأْتِ ابْنَ مَسْعُودٍ فَسَيُتَابِعُنِي. فَسُئِلَ ابْنُ مَسْعُودٍ وَأُخْبِرَ بِقَوْلِ أَبِي مُوسَى، فَقَالَ لَقَدْ ضَلَلْتُ إِذًا وَمَا أَنَا مِنَ الْمُهْتَدِينَ،، أَقْضِي فِيهَا بِمَا قَضَى النَّبِيُّ صلى الله عليه وسلم " لِلاِبْنَةِ النِّصْفُ، وَلاِبْنَةِ ابْنٍ السُّدُسُ تَكْمِلَةَ الثُّلُثَيْنِ، وَمَا بَقِيَ فَلِلأُخْتِ ". فَأَتَيْنَا أَبَا مُوسَى فَأَخْبَرْنَاهُ بِقَوْلِ ابْنِ مَسْعُودٍ، فَقَالَ لاَ تَسْأَلُونِي مَا دَامَ هَذَا الْحَبْرُ فِيكُمْ.
Bukhari
Laws of Inheritance (Al-Faraa'id) • Hadith 13