abdur rehman bin mohammad ibn hussein bin habatullah ibn asakar writes in his book

“umm salma said that the verse of tatheer was revealed in my house,

so i asked prophet asws
“am i in ahlulbait?”

he replied
“you are on betterment, and you are amongst wives”

so i asked
“and who are ahlulbait?”

so he replied
“ali, fatima, hasan and hussein asws”

the scholar further gives the grading of the narration and says

“this hadeeth is sahih”

and further adds that

“this verse was revealed specifically for the ones mentioned above”


al-arbaeen fi manaqib umhat ul momineen, page 105-106