Jami` at-Tirmidhi 3205
Narrated 'Umar bin Abi Salamah - the step-son of the Prophet (ﷺ):
"When these Ayat were revealed to the Prophet (ﷺ): 'Allah only wishes to remove the Rijs from you, O members of the family, and to purify you with a thorough purification (33:33)' in the home of Umm Salamah, he called for Fatimah, Hasan, Husain, and wrapped him in the cloak, and 'Ali was behind him, so he wrapped him in the cloak, then he said: 'O Allah! These are the people of my house, so remove the Rijs from them, and purify them with a thorough purification.' So Umm Salamah said: 'And I, Prophet of Allah?' He said: 'You are in your place (meaning you are already a member of my household), and you are goodness.'"
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا مُحَمَّدُ بْنُ سُلَيْمَانَ بْنِ الأَصْبَهَانِيِّ، عَنْ يَحْيَى بْنِ عُبَيْدٍ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، عَنْ عُمَرَ بْنِ أَبِي سَلَمَةَ، رَبِيبِ النَّبِيِّ صلى الله عليه وسلم قَالَ لَمَّا نَزَلَتْ هَذِهِ الآيَةُ عَلَى النَّبِيِّ صلى الله عليه وسلمَّ  ‏:‏ ‏(‏ إنمَا يُرِيدُ اللَّهُ لِيُذْهِبَ عَنْكُمُ الرِّجْسَ أَهْلَ الْبَيْتِ وَيُطَهِّرَكُمْ تَطْهِيرًا ‏)‏ فِي بَيْتِ أُمِّ سَلَمَةَ فَدَعَا فَاطِمَةَ وَحَسَنًا وَحُسَيْنًا فَجَلَّلَهُمْ بِكِسَاءٍ وَعَلِيٌّ خَلْفَ ظَهْرِهِ فَجَلَّلَهُمْ بِكِسَاءٍ ثُمَّ قَالَ ‏"‏ اللَّهُمَّ هَؤُلاَءِ أَهْلُ بَيْتِي فَأَذْهِبْ عَنْهُمُ الرِّجْسَ وَطَهِّرْهُمْ تَطْهِيرًا ‏"‏ ‏.‏ قَالَتْ أُمُّ سَلَمَةَ وَأَنَا مَعَهُمْ يَا نَبِيَّ اللَّهِ قَالَ ‏"‏ أَنْتِ عَلَى مَكَانِكِ وَأَنْتِ عَلَى خَيْرٍ ‏"‏ ‏.‏ قَالَ هَذَا حَدِيثٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ مِنْ حَدِيثِ عَطَاءٍ عَنْ عُمَرَ بْنِ أَبِي سَلَمَةَ ‏.‏