Therefore...
Therefore, after realizing beyond doubt that Fadak was the personal property of Allah's Messenger (as), it is appropriate to inquire as to what he did with it? But the answer is clear. He granted it to Fatima az-Zahra (sa) before his death. In other words, Fadak became the personal property of Lady Fatima az-Zahra (sa). Moreover, it is not for anyone to object to the Prophet for granting his own property to any person he wished-including his daughter.
Moreover, the following factors can be cited as proofs that the Prophet (S) granted Fadak to his noble daughter (as): Fatima's saying to Imam ‘Ali (as): "This is Ibn Abu Quhafa snatching away my father's grant to me." Fatima az-Zahra’s (sa) saying to Abu Bakr "Surely Fadak was granted to me by my father, the Messenger of Allah (S)." Especially in light of the fact that her infallibility prevents her from uttering falsehood, and from demanding anything, which does not rightfully belong to her.
‘Ali (as), the infallible Imam, would not allow his wife to demand something, which did not belong to her. Imam ‘Ali (as) wrote in his letter to Uthman Ibn Hunaif: "Yes! Fadak was the only land from that which was under the heavens, in our hands; but the inclinations of certain men lusted for it and the souls of others relinquished it." Hence, had it been part of the Prophet's (as) inheritance, he (as) would not have said that it belonged to them (‘Ali (as) and Fatima az-Zahra (sa)).
Imam ‘Ali (as) together with Um Ayman testified to the fact that Allah's Messenger (as) granted it to Lady Fatima az-Zahra (sa), when Abu Bakr requested Fatima az-Zahra (sa) to summon witnesses to prove that he (Prophet (S)) had granted it to her.
Yet, despite these undisputable proofs, Abu Bakr denied Fatima az-Zahra (sa) the possession of Fadak and brought the following as proof of the correctness of his action: According to Abu Bakr, Fadak did not belong to the Messenger of Allah (S); it rather was the property of all Muslims.
Besides, according to Abu Bakr, even if it belonged to the Prophet of Allah (S) , he had heard him saying: "We the group of prophets do not inherit nor are we inherited." Abu Hurairah narrated that the Prophet (S) said: "My inheritance is not to be divided after me, even if it is one dinar or dirham.