Musannaf Ibn Abi Shayba 13:3181

Abu Bakr narrated to us, he said: Jarir narrated to us, from Mughira, from al-Harith, who said: If a house is a plot (khatta) and the people wish to divide it, it is divided according to the inheritance—the inheritance of the deceased owner of the plot. If a person among the heirs or others makes a claim for more than what falls to him from the inheritance, then the burden of proof (al-bayyina) is upon him regarding what he claimed: that so-and-so gave it to him in charity, or gifted it to me, or sold it to me for such-and-such. If a woman or a husband of one of the children of the deceased requests [a share], it is as if he is tasked with the burden of proof that so-and-so inherited from so-and-so, or so-and-so [female] inherited from so-and-so, or that the owner of the plot died before her, or she before him, and thus he inherited from him. He then takes his right. If a man from the children of the owner of the plot makes a claim regarding it, and those who are in possession of it deny his share, then the burden of proof is upon the claimant that so-and-so died before so-and-so, and so-and-so inherited from him, and I inherited from him thereafter. If the heirs acknowledge that the owner of the house had a wife, and her family claims her share, then it is established against them. If they say, "He had divorced her before his death," then the burden of proof is upon them that he had divorced her; otherwise, the inheritance is mandatory for her. If the house is a purchase (shara) and it is in the possession of a group of people, then it belongs to those in whose possession it is. If a person claims a right in it, then the burden of proof is upon him that he has a right in it.