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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 1779

Narrated Qatada:

I asked Anas (about the Prophet's `Umra) and he replied, "The Prophet (ﷺ) performed `Umra when the pagans made him return, and Umra of al-Hudaibiya (the next year), and another `Umra in Dhi-l-Qa'da, and another `Umra in combination with his Hajj."

حَدَّثَنَا أَبُو الْوَلِيدِ، هِشَامُ بْنُ عَبْدِ الْمَلِكِ حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ سَأَلْتُ أَنَسًا ـ رضى الله عنه ـ فَقَالَ اعْتَمَرَ النَّبِيُّ صلى الله عليه وسلم حَيْثُ رَدُّوهُ، وَمِنَ الْقَابِلِ عُمْرَةَ الْحُدَيْبِيَةِ، وَعُمْرَةً فِي ذِي الْقَعْدَةِ وَعُمْرَةً مَعَ حَجَّتِهِ‏.‏
Reference : Sahih al-Bukhari 1779
In-book reference : Book 26, Hadith 6
USC-MSA web (English) reference : Vol. 3, Book 27, Hadith 7
  (deprecated numbering scheme)