كتاب الجهاد والسير
32  
The Book of Jihad and Expeditions
(49)
Chapter: The number of campaigns of the Prophet (saws)
(49)
باب عَدَدِ غَزَوَاتِ النَّبِيِّ صلى الله عليه وسلم
Sahih Muslim 1815 b

The (foregoing) tradition has also been narrated on the authority of Hatim through the same chain of transmitters with the difference that according to this version both these types of expeditions were seven in number.

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا حَاتِمٌ، بِهَذَا الإِسْنَادِ ‏.‏ غَيْرَ أَنَّهُ قَالَ فِي كِلْتَيْهِمَا سَبْعَ غَزَوَاتٍ ‏.‏
Reference : Sahih Muslim 1815b
In-book reference : Book 32, Hadith 180
USC-MSA web (English) reference : Book 19, Hadith 4470
  (deprecated numbering scheme)