The Book of Divorce (Kitab Al-Talaq)
Muslim :: Book 9 : Hadith 3490
A hadith like this is reported on the same authority (but with this difference that the narrator) 'Abd al-Rahman b. Aiman (was mentioned) as the freed slave of 'Urwa (Imam Muslim said: He made a mistake who said that it was 'Urwa; it was in fact the freed slave of 'Azza.)