Sahih Muslim
Sahih Muslim 1815 b
The number of campaigns of the Prophet (saws)
Arabic hadith text
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا حَاتِمٌ، بِهَذَا الإِسْنَادِ . غَيْرَ أَنَّهُ قَالَ فِي كِلْتَيْهِمَا سَبْعَ غَزَوَاتٍ
Translation
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.