It has been shown that the Family of the Prophet (s) – interchangeably referred to as the Ahl al-Bayt, ‘Itrah and Aal - included his daughter Fatima al-Zahra’, her husband Imam ‘Ali, and their children Imams al-Hasan and al-Husayn (‘a). The members of this Family of five, with the Prophet Muhammad (s) at its head, were the ones alive at the time the Qur’anic verses regarding their virtue were being revealed to the Prophet (s).
However, nine other Imams from the descendants of Imam al-Husayn (‘a) are also in this chosen Family, the final one being Imam al-Mahdi (‘a). The Prophet (s) said: "I and ‘Ali and al-Hasan and al-Husayn and nine of the descendants of al-Husayn are the purified ones and the inerrant." [al-Juwayni, Fara'id al-Simtayn, (Beirut, 1978), page 160. Note that al-Juwayni’s greatness as a scholar of hadith has been attested by al-Dhahabi in Tadhkirat al-Huffaz, volume 4, page 298, and also by Ibn Hajar al-‘Asqalani in al-Durar al-Kaminah, volume 1, page 67] "I am the chief of the Prophets and ‘Ali ibn Abi Talib is the chief of successors, and after me my successors shall be twelve, the first of them being ‘Ali ibn Abi Talib and the last of them being al-Mahdi." [al-Juwayni, Fara'id al-Simtayn, page 160] "Al-Mahdi is one of us Ahl al-Bayt" and "al-Mahdi will be of my family, of the descendants of Fatima" [Ibn Majah, al-Sunan, volume 2, page 519, numbers 4085-6; Abu Dawud, al-Sunan, volume 2, page 207]
The question that rises here is "What about the Wives of the Prophet (s)?" The verse of purification "Verily Allah only desires to ... " was revealed to the Prophet (s) in the house of his wife Umm Salama (may Allah be pleased with her); the Prophet called al-Hasan, al-Husayn, Fatima and ‘Ali, and he gathered them together and covered them with the mantle. Then he said, "O Allah, these are my Ahl al-Bayt, so keep away every impurity from the Ahl al-Bayt, and purify them with a perfect purificatio
" Umm Salama said, "Am I with them, O Apostle of Allah?" The Prophet (s) said, "You stay in your place, and you are virtuous." q al-Tirmidhi, al-Sahih, volume 5, pages 351 and 663 q al-Hakim al-Naysaburi, al-Mustadrak `ala al-Sahihayn, volume 2, page 416. He states that it is sahih in accordance with the criteria of al-Bukhari q al-Suyuti, al-Durr al-Manthur, volume 5, page 197 The beginning of verse 33:33 and subsequent statements are addressed to the wives of the Prophet (s) as is evident from the feminine pronouns used.
However, in the verse of purification, the gender changes to the masculine or mixed gender. This also shows that it was an independent revelation addressed to different individuals.