Much of the available knowledge about Muhammad comes through Abu Bakr's daughter, Aisha. After the death of Abu Bakr, her brother Muhammad ibn Abi Bakr was raised by Ali. After Muhammad ibn Abi Bakr was killed by the Umayyads, Aisha raised and taught her nephew Qasim ibn Muhammad ibn Abi Bakr. Aisha also taught another nephew Urwah ibn Zubayr. He then taught his son Hisham ibn Urwah, who was the main teacher of Malik ibn Anas] whose views many Sunni follow.