كتاب الإمارة
33  
The Book on Government
(28)
Chapter: The virtue of Jihad and going out (to fight) in the cause of Allah
(28)
باب فَضْلِ الْجِهَادِ وَالْخُرُوجِ فِي سَبِيلِ اللَّهِ ‏‏
Sahih Muslim 1876 d

It has been narrated on the authority of Abu Huraira that the Messenger of Allah (ﷺ) said:

One who is wounded in the way of Allah-and Allah knows better who is wounded in His way-will appear on the Day of Judgment with his wound bleediing. The colour (of its discharge) will be the colour of blood, (but) its smell will be the smell of musk.
حَدَّثَنَا عَمْرٌو النَّاقِدُ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ لاَ يُكْلَمُ أَحَدٌ فِي سَبِيلِ اللَّهِ - وَاللَّهُ أَعْلَمُ بِمَنْ يُكْلَمُ فِي سَبِيلِهِ - إِلاَّ جَاءَ يَوْمَ الْقِيَامَةِ وَجُرْحُهُ يَثْعَبُ اللَّوْنُ لَوْنُ دَمٍ وَالرِّيحُ رِيحُ مِسْكٍ ‏"‏ ‏.‏
Reference : Sahih Muslim 1876d
In-book reference : Book 33, Hadith 158
USC-MSA web (English) reference : Book 20, Hadith 4629
  (deprecated numbering scheme)