(3) باب كَمِ اعْتَمَرَ النَّبِيُّ صلى الله عليه وسلم
Narrated Abu 'Is-haq:
I asked Masruq, `Ata' and Mujahid (about the `Umra of Allah's Messenger (ﷺ)). They said, "Allah's Messenger (ﷺ) had performed `Umra in Dhi-l-Qa'da before he performed Hajj." I heard Al-Bara' bin `Azib saying, "Allah's Messenger (ﷺ) had performed `Umra in Dhi-l-Qa'da twice before he performed Hajj."
Reference: Sahih al-Bukhari 1781
In-book reference: Book 26, Hadith 9
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 27, Hadith 9