Hadith No: 1
Ibn Abd al-Barr - Al-Isti'ab fi Ma'rifat al-Ashab - Chapter on Ali
1855 - Ali ibn Abi Talib (may he rest in peace) ibn Abd al-Muttalib
ibn Hashim ibn Abd Manaf ibn Qusai al-Qurashi al-Hashimi
Volume: (3) - Page: (1100)
[The text is lengthy, so only the relevant excerpt is provided here]
1855 - .... Ali (may he rest in peace) said: "By Allah, I did not doubt afterward in any judgment between two people And when the verse was revealed: {Indeed, Allah only wishes to remove the impurity from you, O People of the Prophet's House, and to make you pure and spotless} (Surah Al-Ahzab 33:33), the Messenger of Allah (peace be upon him and his holy progeny) called Fatimah, Ali, Hasan, and Husayn (may they rest in peace) in the house of Umm Salamah and said: 'O Allah, these are my family. Remove the impurity from them and make them pure and spotless.'"

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Reference: Al-isteaab fi ma'refat al-ashaab Book 3

Hadith No: 2
Ibn Abd al-Barr - Al-Isti'ab fi Ma'rifati al-Ashab
Letter H - Chapter on Hilal - 2691: Hilal ibn al-Hamra'
Volume: (4) - Page: (1542)
2691 - Hilal ibn al-Hamra': His narration is mentioned in the reports of Abu Ishaq al-Sabi'i from Abu Dawood al-Qass from Abu al-Hamra' who said: I stayed in Medina for a month, and the Messenger of Allah (peace be upon him and his holy progeny) would come to the house of Fatimah and Ali every morning 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).

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Reference: Al-isteaab fi ma'refat al-ashaab Book 4

Hadith No: 3
Ibn Abd al-Barr - Al-Isti'ab fi Ma'rifat al-Ashab
Book of Kunya - Chapter on the letter Ha - 2920 - Abu al-Hamra'
Volume: (4) - Page: (1633)
2920 - Abu al-Hamra', the mawla of the Prophet (peace be upon him and his holy progeny). It is said that his name was Hilal ibn al-Harith, and others say Hilal ibn Dhafar. His narration from the Prophet (peace be upon him and his holy progeny) is that he would pass by the house of Fatimah and Ali (peace be upon them) and say: "Peace be upon you, O People of the House: {Indeed, Allah only wishes to remove the impurity from you, O possessors of the household, and to purify you with a thorough purification"} (Surah al-Ahzab 33:33).

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Reference: Al-isteaab fi ma'refat al-ashaab Book 4