Sahih Muslim Book 8, Hadith Number 3452.
Chapter: Permissibility of bestowing the turn on one’s fellow-wife.
A hadith like this has been transmitted on the authority of Hisham with the same chain of narrators (and the words are): When Sauda became old (the rest of the hadith is the same) and in the narration of Sharik there is an addition (of these words: “She was the first woman whom he (Allah’s Apostle) married after me.”