Language:
كتاب الوصايا
55
Wills and Testaments (Wasaayaa)
(3)
Chapter: To will one-third of one's property
(3)
باب الْوَصِيَّةِ بِالثُّلُثِ
وَقَالَ الْحَسَنُ لاَ يَجُوزُ لِلذِّمِّيِّ وَصِيَّةٌ إِلاَّ الثُّلُثُ.
وَقَالَ اللَّهُ تَعَالَى: {وَأَنِ احْكُمْ بَيْنَهُمْ بِمَا أَنْزَلَ اللَّهُ}.

Narrated Sa`d:

I fell sick and the Prophet (ﷺ) paid me a visit. I said to him, "O Allah's Messenger (ﷺ)! I invoke Allah that He may not let me expire in the land whence I migrated (i.e. Mecca)." He said, "May Allah give you health and let the people benefit by you." I said, "I want to will my property, and I have only one daughter and I want to will half of my property (to be given in charity)." He said," Half is too much." I said, "Then I will one third." He said, "One-third, yet even one-third is too much." (The narrator added, "So the people started to will one third of their property and that was Permitted for them.")

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الرَّحِيمِ، حَدَّثَنَا زَكَرِيَّاءُ بْنُ عَدِيٍّ، حَدَّثَنَا مَرْوَانُ، عَنْ هَاشِمِ بْنِ هَاشِمٍ، عَنْ عَامِرِ بْنِ سَعْدٍ، عَنْ أَبِيهِ ـ رضى الله عنه ـ قَالَ مَرِضْتُ فَعَادَنِي النَّبِيُّ صلى الله عليه وسلم فَقُلْتُ يَا رَسُولَ اللَّهِ ادْعُ اللَّهَ أَنْ لاَ يَرُدَّنِي عَلَى عَقِبِي‏.‏ قَالَ ‏"‏ لَعَلَّ اللَّهَ يَرْفَعُكَ وَيَنْفَعُ بِكَ نَاسًا ‏"‏‏.‏ قُلْتُ أُرِيدُ أَنْ أُوصِيَ، وَإِنَّمَا لِي ابْنَةٌ ـ قُلْتُ ـ أُوصِي بِالنِّصْفِ قَالَ ‏"‏ النِّصْفُ كَثِيرٌ ‏"‏‏.‏ قُلْتُ فَالثُّلُثِ‏.‏ قَالَ ‏"‏ الثُّلُثُ، وَالثُّلُثُ كَثِيرٌ أَوْ كَبِيرٌ ‏"‏‏.‏ قَالَ فَأَوْصَى النَّاسُ بِالثُّلُثِ، وَجَازَ ذَلِكَ لَهُمْ‏.‏
Reference : Sahih al-Bukhari 2744
In-book reference : Book 55, Hadith 7
USC-MSA web (English) reference : Vol. 4, Book 51, Hadith 7
  (deprecated numbering scheme)