Sahih Muslim Book 26, Hadith Number 5396.
Chapter : Permissibility of women going out in the fields for easing themselves.
This hadith has been narrated on the authority of Hisham with the same chain of transmitters, and the words are: She (Sauda) was a woman who looked to be significant amongst the people (so far as the bulk of her) body was concerned. The rest of the hadith is the same.