صحيح البخاري Sahih Bukhari كتاب الوصايا The Book of Wasaya (Wills and Testaments)
بَابُ الْوَصِيَّةِ بِالثُّلُثِ:

(3) Chapter. To will one-third of one’s property.

2 hadith
Hadith 2743
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ ، حَدَّثَنَا سُفْيَانُ ، عَنْ هِشَامِ بْنِ عُرْوَةَ ، عَنْ أَبِيهِ ، عَنْ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا ، قَالَ : " لَوْ غَضَّ النَّاسُ إِلَى الرُّبْعِ لِأَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، قَالَ : الثُّلُثُ وَالثُّلُثُ كَثِيرٌ أَوْ كَبِيرٌ " .
Narrated Ibn `Abbas: I recommend that people reduce the proportion of what they bequeath by will to the fourth (of the whole legacy), for Allah's Apostle said, "One-third, yet even one third is too much."
Hadith Reference Sahih Bukhari / The Book of Wasaya (Wills and Testaments) / Hadith: 2743
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة
Hadith 2744
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الرَّحِيمِ ، حَدَّثَنَا زَكَرِيَّاءُ بْنُ عَدِيٍّ ، حَدَّثَنَا مَرْوَانُ ، عَنْ هَاشِمِ بْنِ هَاشِمٍ ، عَنْ عَامِرِ بْنِ سَعْدٍ ، عَنْ أَبِيهِ رَضِيَ اللَّهُ عَنْهُ ، قَالَ : " مَرِضْتُ ، فَعَادَنِي النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، فَقُلْتُ : يَا رَسُولَ اللَّهِ ، ادْعُ اللَّهَ أَنْ لَا يَرُدَّنِي عَلَى عَقِبِي ، قَالَ : لَعَلَّ اللَّهَ يَرْفَعُكَ وَيَنْفَعُ بِكَ نَاسًا ، قُلْتُ : أُرِيدُ أَنْ أُوصِيَ وَإِنَّمَا لِي ابْنَةٌ ، قُلْتُ : أُوصِي بِالنِّصْفِ ، قَالَ : النِّصْفُ كَثِيرٌ ، قُلْتُ : فَالثُّلُثِ ، قَالَ : الثُّلُثُ وَالثُّلُثُ كَثِيرٌ أَوْ كَبِيرٌ ، قَالَ : فَأَوْصَى النَّاسُ بِالثُّلُثِ ، وَجَازَ ذَلِكَ لَهُمْ " .
Narrated Sa`d: I fell sick and the Prophet paid me a visit. I said to him, "O Allah's Apostle! 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.")
Hadith Reference Sahih Bukhari / The Book of Wasaya (Wills and Testaments) / Hadith: 2744
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة