It wasnarrated from Sa'eed bin Musayyab that Jubair bin Mut'im toldhimthat he and 'Uthman bin 'Affan came to the Messenger of Allah(ﷺ) to speak to him about the way in which the one fifth fromKhaibar had been distributed to Banu Hashim and Banu Muttalib. Theysaid:
"You have distributed it to our brothers Banu Hashim and BanuMuttalib, but we are related to you (to Banu Hashim) in the same way(as Banu Muttalib)." The Messenger of Allah (ﷺ) said: "Rather Ithink that Banu Hashim and Banu Muttalib are the same."*
English reference: Vol. 4, Book 24, Hadith 2881
Arabic reference: Book 24, Hadith 2991