It has been narrated from Ahlul Bayt (a.s): (Verily, the best of works are Wilayah ([accepting the authority of and following Ahlul Bayt a.s.]) and Innocence ([declaring oneself innocent from the enemies of Ahlul Bayt a.s]). Meaning, taking the Supporters/Devotees of Allah as an authority over him, and they are the Prophets and Vicegerents, and being enemies with the enemies of Allah, and they are the enemies of the Prophets and Vicegerents and the enemies of their Shia (followers). So which work is put forth before the other, Wilayah or declaring oneself innocent [from the enemies of Allah]?
Unfortunately, after the martyrdom of the Messenger of God, Abu Bakr, and Umar broke into Fatima’s house to force Ali bin Abi Talib to pledge allegiance to Abu Bakr. This incident resulted in the injury of Fatima pbuh, the miscarriage of her son al-Muhsin, and her death shortly afterwards. This was just as the Messenger of God, Muhammad pbuhap, promised her: that she would be the first one to follow him. Thus, she was the first martyr mentioned in the Sacred Will of the Prophet.