Language:
كتاب العمرة
26  
`Umrah (Minor pilgrimage)
(3)
Chapter: How many times did the Prophet (saws) perform 'Umra ?
(3)
باب كَمِ اعْتَمَرَ النَّبِيُّ صلى الله عليه وسلم
Sahih al-Bukhari 1780

Narrated Hammam:

The Prophet (ﷺ) performed four `Umra (three) in Dhi-l-Qa'da except the (one) `Umra which he performed with his Hajj: His `Umra from Al-hudaibiya, and the one of the following year, and the one from Al- Jr'rana where he distributed the booty (of the battle) of Hunain, and another `Umra with his Hajj.

حَدَّثَنَا هُدْبَةُ، حَدَّثَنَا هَمَّامٌ، وَقَالَ، اعْتَمَرَ أَرْبَعَ عُمَرٍ فِي ذِي الْقَعْدَةِ إِلاَّ الَّتِي اعْتَمَرَ مَعَ حَجَّتِهِ عُمْرَتَهُ مِنَ الْحُدَيْبِيَةِ، وَمِنَ الْعَامِ الْمُقْبِلِ، وَمِنَ الْجِعْرَانَةِ، حَيْثُ قَسَمَ غَنَائِمَ حُنَيْنٍ، وَعُمْرَةً مَعَ حَجَّتِهِ‏.‏
Reference : Sahih al-Bukhari 1780
In-book reference : Book 26, Hadith 7
USC-MSA web (English) reference : Vol. 3, Book 27, Hadith 8
  (deprecated numbering scheme)