Original sentence: "Umar threatened to set the house on fire unless they came out and swore allegiance to Abu Bakr.(see Genealogy of Khadijah's Daughters).Modern descendants of Muhammad trace their lineage exclusively through Fatimah and her husband Ali ibn Abi Talib (the first Shi'ah Imam and the fourth Sunni Caliph), because she was the only child of Muhammad who had children that survived.Shi'as have different ideas about the number of Mohammad's daughter.Sunni Muslim reject this account and claim that Muhsin later died as a child, and that Fatimah died a natural death.Sunnis narrate that after he threatened the guys came out from Fatimah's house but Shias say he fulfilled his threat, although Fatimah stood behinde the door to prohibit his invasion.There's disagreement between Shia and Sunni historians.Umar led a party of armed men against Ali's house in Medina and called for Ali and his men to come out and swear allegiance to Abu Bakr.Umar threatened to burn the house down if they did not submit.When Abu Bakr become caliph some of the companions who disagreed with his caliphate gathered in Fatimah's house.Wilferd Madelung has said
Edited sentence: Modern descendants of Muhammad trace their lineage exclusively through Fatimah and her only husband Ali ibn Abi Talib (the first Shi'ah Imam and the fourth Sunni Caliph), because she was the only child of Muhammad who had children that survived.Shi'as, however, maintain that she was Muhammad's only daughter (see Genealogy of Khadijah's Daughters).Sunni Muslims reject this account and claim that Muhsin later died as a child.Umar and Khalid ibn Walid threatened to burn the house down if they did not submit.Umar led a party of armed men against Ali's house in Medina and called for Ali and his men to come out and swear allegiance to Abu Bakr, who they had decided would take power in the meeting at Saqifah