Purification (from ritual impurities by means of wudu or ghusl)
وَقَرْنَ فِي بُيُوتِكُنَّ وَلَا تَبَرَّجْنَ تَبَرُّجَ الْجَاهِلِيَّةِ الْأُولَىٰ ۖ وَأَقِمْنَ الصَّلَاةَ وَآتِينَ الزَّكَاةَ وَأَطِعْنَ اللَّهَ وَرَسُولَهُ ۚ إِنَّمَا يُرِيدُ اللَّهُ لِيُذْهِبَ عَنْكُمُ الرِّجْسَ أَهْلَ الْبَيْتِ وَيُطَهِّرَكُمْ تَطْهِيرًا {33}
And stay in your houses and do not display your finery like the displaying of the Pre-Islamic period before; and establish the Salat and give the Zakat, and obey Allah and His Rasool. But rather, Allah Intends to Keep the uncleanness away from you, People of the Household, and Purify you (with) a (thorough) Purification [33:33]
وعنه، قال: حدثنا عبد العزيز بن يحيى، عن محمد بن زكريا، عن جعفر بن محمد بن عمارة، قال: حدثني أبي، عن جعفر بن محمد، عن أبيه (عليهما السلام)، قال: «قال علي بن أبي طالب (عليه السلام): إن الله عز و جل فضلنا أهل البيت، و كيف لا يكون كذلك، و الله عز و جل يقول في كتابه: إِنَّما يُرِيدُ اللَّهُ لِيُذْهِبَ عَنْكُمُ الرِّجْسَ أَهْلَ الْبَيْتِ وَ يُطَهِّرَكُمْ تَطْهِيراً»؟
And from him (Sharaf Al Deen Al Najafi) who said, ‘It was narrated to us by Abdul Aziz Bin Yahya, from Muhammad Bin Zakariyya, from Ja’far Bin Muhammad Bin Amarat, from his father,
From Ja’far Bin Muhammad-asws, from his-asws father-asws having said: ‘Ali-asws Bin Abu Talib-asws said: ‘Allah-azwj Mighty and Majestic Merited us-asws, the People-asws of the Household, and how can it not happen to be like that, and Allah-azwj Mighty and Majestic is Saying in His-azwj Book: But rather, Allah Intends to Keep the uncleanness away from you, People of the Household, and Purify you (with) a Purification [33:33]?
فقد طهرنا الله من الفواحش، ما ظهر منها و ما بطن، فنحن على منهاج الحق
Thus, Allah-azwj Purified us-asws from the immoralities, whatever is apparent from these and whatever is hidden, and we-asws are upon the manifesto of the Truth’’.[1]
[1] تأويل الآيات 2: 458/ 22