Amr b. Muslim al-Jundani reported that Ibn Musayyib had told him that it was Umm Salama, the wife of Allah's Apostle (ﷺ), who had informed him of that as narrated above.
Sahih Muslim Book 35, Hadith 59
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While we were in a bathroom just before 'Id al-Adha some of the persons tried to remove the hair with the help of hair-removing chemicals. Thereupon some of the people owning the bath (or some of the people sitting therein) said that Sa'id b. Musayyib did not approve of it, or he prohibited it. Then I met Sa'id b. Musayyib and made a mention of that to him, whereupon he said: O my nephew, this is the hadith which has been forgotten, and abandoned. Umm Salama, the wife of Allah's Apostle (ﷺ), narrated to me Allah's Messenger (ﷺ) having said as narrated above.
Sahih Muslim Book 35, Hadith 58 Next Hadith → I was in the company of 'Ali b. Abi Talib, when a person came to him, and said: What was it that Allah's Apostle (ﷺ) told you in secret? Thereupon he (liadrat 'All) was enraged and said: Allah's Apostle (ﷺ) did not tell me anything in secret that he hid from people, except that he told me four things. He said: Com- mader of Faithful, what are these? He said: Allah cursed him who cursed his father; Allah cursed him who sacrificed for anyone besides Allah; and Allah cursed him who accommodates an innovator (in religion) ; and Allah cursed him who changed the minarets (the boundary lines) of the land.
Sahih Muslim Book 35, Hadith 60
Sahih Muslim Book 35, Hadith 58 Next Hadith → I was in the company of 'Ali b. Abi Talib, when a person came to him, and said: What was it that Allah's Apostle (ﷺ) told you in secret? Thereupon he (liadrat 'All) was enraged and said: Allah's Apostle (ﷺ) did not tell me anything in secret that he hid from people, except that he told me four things. He said: Com- mader of Faithful, what are these? He said: Allah cursed him who cursed his father; Allah cursed him who sacrificed for anyone besides Allah; and Allah cursed him who accommodates an innovator (in religion) ; and Allah cursed him who changed the minarets (the boundary lines) of the land.
Sahih Muslim Book 35, Hadith 60