Fatimah and Abbas came to Abu Bakr seeking their inheritance, namely his land at Fadak and his share from Khaybar.Abu Bakr said, "I heard the Prophet ﷺ say, 'We are not inherited from. Whatever we leave behind is charity. The family of Muhammad may only eat from this wealth.' By Allah, maintaining ties with the relatives of the Messenger of Allah ﷺ is dearer to me than maintaining ties with my own relatives."
أن فاطمة والعباس أتيا أبا بكر يلتمسان ميراثهما: أرضه من فدك، وسهمه من خيبر. فقال أبو بكر: سمعت النبي ﷺ يقول: لا نورث ما تركنا صدقة، إنما يأكل آل محمد في هذا المال. والله لقرابة رسول الله ﷺ أحب إلي أن أصل من قرابتي.
Bukhari narrated it in Maghazi (4035, 4036) and Muslim in Jihad and Expeditions (1759:53), both via Mamar, from Zuhri, from Urwa, from Ayesha, who said, and she then mentioned it, the wording given here being Bukhari's.His words, "We leave no inheritance, what we leave is charity," mean his estate. It was not to be divided, but rather spent on his wives and family, and what remained was charity, spent on the poor among the Muslims, as indicated by the earlier hadith of Abu Hurairah.As for the details of his estate ﷺ, they are as Ibn Sayyid al-Nas described, "On the day he ﷺ died he left two Hibarah garments, an Omani waist-wrap, two other garments, a Sahari shirt, a Suhuli shirt, a Yemeni cloak, a khamisa, a white cloak, three or four caps, and a wars-dyed wrap."Of land, he left half the land of Fadak, a third of the land of Wadi Qura, his share of the fifth of Khaybar, and his portion of the land of Banu Nadir. He made this land a charity during his lifetime for his family, his servants, and the poor among the Muslims. End of quote.He overlooked mentioning two of the forts of Khaybar, Watih and Sulalim, which were taken through a peace agreement.Likewise there was what Mukhayriq, the Jewish Nadiri Israelite from Banu Nadir, gifted him. Mukhayriq had embraced Islam and was martyred at Uhud, and before his death he said, "My wealth belongs to Muhammad, Messenger of Allah ﷺ, for him to dispose of as he wishes." It consisted of seven walled gardens, namely Maythab, Safiya, Dalal, Husna, Buraqa, Aawaf, and Mashrabat Umm Ibrahim.Likewise there was what the Ansar gave him of their lands, the parts that water could not reach.All of this was the property of the Messenger of Allah ﷺ, but he did not keep it for himself. Rather, he spent it on his family, on the Muslims, and for the public good.Matters remained this way until the time of Abu Bakr Siddiq . Then Umar bin Khattab
came and handed over his charity in Madinah to Ali bin Abu Talib and Abbas bin Abdul-Muttalib, and Ali gained sole control of it over Abbas. It then passed to Hasan bin Ali, then to Husayn bin Ali, then to Ali bin Husayn and Hasan bin Hasan, who shared it between them, then to Zayd bin Hasan, as recorded in Sahih Bukhari (4034).As for Khaybar and Fadak, Umar kept them, saying, "They are the charity of the Messenger of Allah ﷺ, and their matter rests with whoever holds authority after them." This practice continued, and eventually they were incorporated into the treasury of the Muslims.