Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(4)
Chapter: The superiority of Al-Hajj-ul-Mabrur
(4)
باب فَضْلِ الْحَجِّ الْمَبْرُورِ
Sahih al-Bukhari 1519

Narrated Abu Huraira:

The Prophet (ﷺ) was asked, "Which is the best deed?" He said, "To believe in Allah and His Apostle." He was then asked, "Which is the next (in goodness)?" He said, "To participate in Jihad in Allah's Cause." He was then asked, "Which is the next?" He said, "To perform Hajj-Mabrur. "

حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ سُئِلَ النَّبِيُّ صلى الله عليه وسلم أَىُّ الأَعْمَالِ أَفْضَلُ قَالَ ‏"‏ إِيمَانٌ بِاللَّهِ وَرَسُولِهِ ‏"‏‏.‏ قِيلَ ثُمَّ مَاذَا قَالَ ‏"‏ جِهَادٌ فِي سَبِيلِ اللَّهِ ‏"‏‏.‏ قِيلَ ثُمَّ مَاذَا قَالَ ‏"‏ حَجٌّ مَبْرُورٌ ‏"‏‏.‏
Reference : Sahih al-Bukhari 1519
In-book reference : Book 25, Hadith 7
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 594
  (deprecated numbering scheme)