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 1814 b

It has been narrated by Buraida who heard it from his father that he joined the Messenger of Allah (ﷺ) in sixteen military campaigns

وَحَدَّثَنِي أَحْمَدُ بْنُ حَنْبَلٍ، حَدَّثَنَا مُعْتَمِرُ بْنُ سُلَيْمَانَ، عَنْ كَهْمَسٍ، عَنِ ابْنِ بُرَيْدَةَ، عَنْ أَبِيهِ، أَنَّهُ قَالَ غَزَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم سِتَّ عَشْرَةَ غَزْوَةً ‏.‏
Reference : Sahih Muslim 1814b
In-book reference : Book 32, Hadith 178
USC-MSA web (English) reference : Book 19, Hadith 4468
  (deprecated numbering scheme)