محمد بن أبي بكر
After the death of Abu Bakr, Ali raised Muhammad ibn Abi Bakr. The Twelver Shia view Muhammad ibn Abi Bakr as one of the companions of Ali. When Muhammad ibn Abi Bakr was killed by the Ummayads, Aisha, the third wife of Muhammad, raised and taught her nephew Qasim ibn Muhammad ibn Abu Bakr. Qasim ibn Muhammad ibn Abu Bakr's mother was from Ali's family and Qasim's daughter Farwah bint al-Qasim was married to Muhammad al-Baqir and was the mother of Jafar al-Sadiq. Therefore, Qasim ibn Muhammad ibn Abu Bakr was the grandson of Abu Bakr and the grandfather of Jafar al-Sadiq. Zaydis, the largest group amongst the Shia before the Safavid Dynasty and currently the second-largest group (although its population is only about 5% of all Shia Muslims), believe that on the last hour of Zayd ibn Ali (the uncle of Jafar al-Sadiq), he was betrayed by the people in Kufa who said to him: "May God have mercy on you! What do you have to say on the matter of Abu Bakr and Umar ibn al-Khattab?" Zayd ibn Ali said, "I have not heard anyone in my family renouncing them both nor saying anything but good about them...when they were entrusted with government they behaved justly with the people and acted according to the Quran and the Sunnah".