Hadith No: 1
Ibn Hajar al-Asqalani - Fath al-Bari Sharh Sahih al-Bukhari
Book of the Virtues of the Ansar - Chapter on the Prophet's (peace be upon him and his holy progeny) Marriage to Khadijah and Her Excellence
Volume: (7) - Page Number: (104)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... His statement: (of stalks) .... in the interpretation of God's statement, the Exalted: {Indeed, God only wishes to remove the impurity from you, O people of the Prophet's household, and to make you pure and spotless} (Surah al-Ahzab 33:33) Um Salamah said: "When this was revealed, the Prophet (peace be upon him and his holy progeny) called Fatimah, Ali, Hasan, and Husayn and enveloped them in a cloak, saying, 'O Allah, these are my household.'" The narration was narrated by al-Tirmidhi and others, and the reference of these people of the household goes back to Khadijah because Hasan and Husayn are from Fatimah, and Fatimah is her daughter. Ali grew up in Khadijah's house as a child and later married her daughter. Thus, the return of the noble Prophet's household is shown to be to Khadijah and not to anyone else.

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Reference: Fath al-Baari fi Sharh Saheeh al-Bukhari Book 7

Hadith No: 2
Ibn Hajar al-Asqalani - al-Matalib al-Aliyah bi-Zawa'id al-Masanid al-Thamaniyah
Book of Tafsir - Surah al-Ahzab
Volume: (15) - Page Number: (123)
3686 - Abu Bakr said: Yahya ibn Ya'la al-Aslami narrated to us, from Yunus ibn Khabbab, from Nafi' from Abu al-Hamra, who said: "I witnessed with the Prophet (peace be upon him) for eight months. Whenever he went out to pray or, he said, for the Fajr prayer, he would pass by Fatimah's door and say: 'Peace be upon you, O People of the House': {Indeed, Allah only wishes to remove the impurity from you, O People of the House, and to purify you with a thorough purification} (Surah al-Ahzab 33:33).

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 15

Hadith No: 3
Ibn Hajar al-Asqalani - al-Matalib al-Aliyah bi-Zawa'id al-Masanid al-Thamaniyah
Book of Tafsir - Surah al-Ahzab
Volume: (15) - Page Number: (124)
3686 - He said: Abu Nu'aym narrated to us, saying: Yunus ibn Abi Ishaq narrated to us, saying: Abu Dawood narrated from Abu al-Hamra, who said: "I remained in military watch (murabita) in Medina for seven months during the time of the Messenger of Allah (peace be upon him and his holy progeny). He said: I saw the Messenger of Allah (peace be upon him and his holy progeny) when dawn broke, come to the door of Ali and Fatimah, and say: 'Prayer, prayer!' {Indeed, Allah only wishes to remove the impurity from you, O People of the Prophet's House, and to purify you with a thorough purification} (Surah al-Ahzab 33:33). I said: Abu Dawood is Nafi' in the one before it.

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 15

Hadith No: 4
Ibn Hajar al-Asqalani - Al-Matalib al-Aliyah bi-Zawa'id al-Masaneed al-Thamaniyah
Book of Tafsir - Surah Al-Ahzab
Volume: (15) - Page Number: (125)
3686 - And Abd said: Al-Duhhak ibn Makhlad narrated to me, saying: Abu Dawud al-Sabii narrated to me, who said: Abu al-Humaira narrated to me, saying: "I accompanied the Messenger of Allah for seven months, and when he would wake up in the morning, he would go to the door of Ali and Fatimah, saying: 'Prayer! May Allah have mercy on you!' {Indeed, Allah only wishes to remove all impurity from you, O People of the Prophet's House, and to make you pure and holy" (Al-Ahzab 33:33)}. I said: Abu Dawud is Nafi, and it is said that he is Nafi the Blind. Qatadah declared him a liar, and he is very weak. However, Ahmad narrated it through the route of Ali ibn Zayd from Anas with a similar meaning.

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Reference: Al-Mataaleb al-Aaleyah BeZawaaed al-Masaaneed al-Samaaneyah Book 15

Hadith No: 5
Ibn Hajar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah - Supplement to the Chapter on the Unmarked Letter 'Ayn
Supplement to the First Part of the Chapter on the Letter 'Ayn - Following 'Ayn is the Letter Ta - 5596: At-Taiyya unassigned
Volume: (4) - Page Number: (423)
[The text is lengthy, so only the relevant excerpt is provided here]
5596 - .... Al-Isma'ili mentioned him among the companions and narrated from the route of Ali ibn Hisham, from Umayr Abi 'Urfajeh from At-Taiyya, who said: "The Messenger of Allah (peace be upon him and his holy progeny) entered upon Fatimah while she was preparing a thick porridge, and he mentioned the story of covering them and the revelation of His statement, the Almighty: {Indeed, Allah only intends to remove from you, O you who are the People of the Prophet's House, all impurity and to purify you with a thorough purification} (Quran 33:33). I say: The essence of this hadith was narrated by al-Tabari in his Tafsir."

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 4

Hadith No: 6
Ibn Hajar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah - Supplement to the Letter 'Ayn (غ)
Supplement to the First Section of the Letter 'Ayn - 'Ayn followed by Lam
5704 - Ali ibn Abi Talib al-Hashimi (r)
Volume: (4) - Page Number: (466/467)
[The text is long, so only the relevant excerpt is provided here]
5704 - .... Ahmad and al-Nasa'i narrated from the route of 'Amr ibn Maymun: I was sitting with Ibn Abbas when seven men came to him and he mentioned a story in which it was said that he had come, shaking off his robe, and he said: "They attacked a man of honor, and the Prophet (peace be upon him and his holy progeny) said: 'I will send a man whom Allah will not disgrace, who loves Allah and His Messenger.'" Then he came, he was eye-bleary, and he spurted into his eyes, then shook the flag three times and gave it to him. He came with Safiyya bint Huyayy and he sent him to recite Surah Bara'ah (Chapter 9) to the Quraysh, saying: "No one will go except a man from me and I am from him." He said to his cousins: "Which of you will be my supporter in this world and the Hereafter?" They all refused, so Ali said: "I will," and he said: "He is my supporter in this world and the Hereafter." And he took his cloak and placed it on Ali, Fatimah, Hasan, and Husayn, and said: {Indeed, Allah intends to remove all impurity from you, O People of the Prophet's House, and to make you pure and holy} (Surah Al-Ahzab 33:33).

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 4

Hadith No: 7
Ibn Hajar al-Asqalani - Al-Isabah fi Tamyiz al-Sahabah - Book of Women - Letter Fa
11586 - The virtuous woman of Abdullah ibn Unays
Volume: (8) - Page Number: (265)
[The text is lengthy, so only the relevant excerpt is provided here]
11586 - .... And al-Dulabi narrated in al-Dhurriyah al-Tahirah with a good chain from Abdullah ibn Buraydah, from his father, who said: The Messenger of Allah (peace be upon him and his holy progeny) said on the night Ali was married to Fatimah: "Do not initiate anything until you meet me." Then he called for water, performed ablution with it, and poured it over them, saying: "O Allah, bless them, and may Your blessings be upon them, and grant them blessing in their descendants." And Um Salamah said: "In my house, the verse was revealed:" {“Allah only wishes to remove the impurity from you, O People of the Prophetic Household, and to purify you with a thorough purification”} (Surah al-Ahzab 33:33). She said: Then the Messenger of Allah (peace be upon him and his holy progeny) sent for Fatimah, Ali, Hasan, and Husayn, and said: "These are the People of my House," the narration continues.

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Reference: Al-Isaabah Fi Tamyeez al-Sahaabah Book 8

Hadith No: 8
Ibn Hajar al-Asqalani - Tahdhib al-Tahdhib - Chapter on the letter Ha
Those Named Al-Hasan - 528: Khat 4 - Al-Hasan ibn Ali ibn Abi Talib al-Hashimi (peace be upon him)
Volume: (2) - Page Number: (297)
[The text is lengthy, so only the relevant excerpt is provided here]
528 - .... And Shahru ibn Hawshab narrated from Umm Salamah that the Prophet (peace be upon him and his holy progeny) covered Ali, Hasan, Husayn, and Fatimah with a cloak and then said: "O Allah, these are the People of my House and my innermost companions. O Allah, remove from them impurity and make them thoroughly pure." There are various chains for this narration from Umm Salamah.

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Reference: Tazheeb al Tahzeeb Book 2