It was revealed concerning the wives of the Prophet ﷺ specifically.
في قوله تعالى: {إنما يريد الله ليذهب عنكم الرجس أهل البيت ويطهركم تطهيرا}
نزلت في نساء النبي ﷺ خاصة.
No references are available.
Ibn Abu Hatim narrated it, as Ibn Kathir mentioned in his Tafsir, from Ali bin Harb Mawsili, who said, Zayd bin Hubab told us, Husayn bin Waqid told us, from Yazid Nahwi, from Ikrima, from Ibn Abbas, and he mentioned it.Its isnad is hasan because of Zayd bin Hubab and his teacher Husayn bin Waqid, for both of them are graded hasan in hadith transmission.