Language:
كتاب الجهاد والسير
56  
Fighting for the Cause of Allah (Jihaad)
(71)
Chapter: The service, during holy battles
(71)
باب فَضْلِ الْخِدْمَةِ فِي الْغَزْوِ
Sahih al-Bukhari 2889

Narrated Anas bin Malik:

I went along with the Prophet (ﷺ) to Khaibar so as to serve him. (Later on) when the Prophet (ﷺ) returned he, on seeing the Uhud mountain, said, "This is a mountain that loves us and is loved by us." Then he pointed to Medina with his hand saying, "O Allah! I make the area which is in between Medina's two mountains a sanctuary, as Abraham made Mecca a sanctuary. O Allah! Bless us in our Sa` and Mudd (i.e. units of measuring)."

حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، عَنْ عَمْرِو بْنِ أَبِي عَمْرٍو، مَوْلَى الْمُطَّلِبِ بْنِ حَنْطَبٍ، أَنَّهُ سَمِعَ أَنَسَ بْنَ مَالِكٍ ـ رضى الله عنه ـ يَقُولُ خَرَجْتُ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم إِلَى خَيْبَرَ أَخْدُمُهُ، فَلَمَّا قَدِمَ النَّبِيُّ صلى الله عليه وسلم رَاجِعًا، وَبَدَا لَهُ أُحُدٌ قَالَ ‏"‏ هَذَا جَبَلٌ يُحِبُّنَا وَنُحِبُّهُ ‏"‏‏.‏ ثُمَّ أَشَارَ بِيَدِهِ إِلَى الْمَدِينَةِ قَالَ اللَّهُمَّ إِنِّي أُحَرِّمُ مَا بَيْنَ لاَبَتَيْهَا كَتَحْرِيمِ إِبْرَاهِيمَ مَكَّةَ ‏"‏ اللَّهُمَّ بَارِكْ لَنَا فِي صَاعِنَا وَمُدِّنَا ‏"‏‏.‏
Reference : Sahih al-Bukhari 2889
In-book reference : Book 56, Hadith 104
USC-MSA web (English) reference : Vol. 4, Book 52, Hadith 139
  (deprecated numbering scheme)