كتاب السلام
39
The Book of Greetings
(7)
Chapter: The Permissibility Of Women Going Out To Relieve Themselves
(7)
باب إِبَاحَةُ الْخُرُوجِ لِلنِّسَاءِ لِقَضَاءِ حَاجَةِ الإِنْسَانِ ‏‏

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.
وَحَدَّثَنَاهُ أَبُو كُرَيْبٍ، حَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا هِشَامٌ، بِهَذَا الإِسْنَادِ وَقَالَ وَكَانَتِ امْرَأَةً يَفْرَعُ النَّاسَ جِسْمُهَا ‏.‏ قَالَ وَإِنَّهُ لَيَتَعَشَّى ‏.‏

وَحَدَّثَنِيهِ سُوَيْدُ بْنُ سَعِيدٍ، حَدَّثَنَا عَلِيُّ بْنُ مُسْهِرٍ، عَنْ هِشَامٍ، بِهَذَا الإِسْنَادِ ‏.‏

Reference : Sahih Muslim 2170 b, c
In-book reference : Book 39, Hadith 24
USC-MSA web (English) reference : Book 26, Hadith 5396
  (deprecated numbering scheme)