Who are the Ahlul Bayt?

Who does the Quran refer to when it says Ahlul Bayt? Sheikh Azhar Nasser compares Sunni and Shia viewpoints based on hadit from Sunni sources.The three main perspectives are:- It includes the Prophet's wives, Bani Hashim, and the Holy Five (Ali, Fatima, Hassan, Hussain, and Prophet Muhammad)- It includes just Bani Hashim and the Holy Five- It includes just the Holy Five (shia perspective)Sheikh Azhar discusses arguments for and against the verse of Purity (Quran 33:33) applying the wives as w...