Sahih Bukhari Volume 5, Book 62, Hadith 3714

فَقَالَ أَبُو بَكْرٍ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ لاَ نُورَثُ، مَا تَرَكْنَا فَهْوَ صَدَقَةٌ، إِنَّمَا يَأْكُلُ آلُ مُحَمَّدٍ مِنْ هَذَا الْمَالِ ـ يَعْنِي مَالَ اللَّهِ ـ لَيْسَ لَهُمْ أَنْ يَزِيدُوا عَلَى الْمَأْكَلِ ‏"‏‏.‏ وَإِنِّي وَاللَّهِ لاَ أُغَيِّرُ شَيْئًا مِنْ صَدَقَاتِ النَّبِيِّ صلى الله عليه وسلم الَّتِي كَانَتْ عَلَيْهَا فِي عَهْدِ النَّبِيِّ صلى الله عليه وسلم، وَلأَعْمَلَنَّ فِيهَا بِمَا عَمِلَ فِيهَا رَسُولُ اللَّهِ صلى الله عليه وسلم‏.‏ فَتَشَهَّدَ عَلِيٌّ، ثُمَّ قَالَ إِنَّا قَدْ عَرَفْنَا يَا أَبَا بَكْرٍ فَضِيلَتَكَ‏.‏ وَذَكَرَ قَرَابَتَهُمْ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم وَحَقَّهُمْ‏.‏ فَتَكَلَّمَ أَبُو بَكْرٍ فَقَالَ وَالَّذِي نَفْسِي بِيَدِهِ، لَقَرَابَةُ رَسُولِ اللَّهِ صلى الله عليه وسلم أَحَبُّ إِلَىَّ أَنْ أَصِلَ مِنْ قَرَابَتِي‏.‏

Abu Bakr said, "Allah's Apostle said, 'We (Prophets), our property is not inherited, and whatever we leave is Sadaqa, but Muhammad's Family can eat from this property, i.e. Allah's property, but they have no right to take more than the food they need.' By Allah! I will not bring any change in dealing with the Sadaqa of the Prophet (and will keep them) as they used to be observed in his (i.e. the Prophet's) life-time, and I will dispose with it as Allah's Apostle used to do," Then 'Ali said, "I testify that None has the right to be worshipped but Allah, and that Muhammad is His Apostle," and added, "O Abu Bakr! We acknowledge your superiority." Then he (i.e. 'Ali) mentioned their own relationship to Allah's Apostle and their right. Abu Bakr then spoke saying, "By Allah in Whose Hands my life is. I love to do good to the relatives of Allah's Apostle rather than to my own relatives"