From Sahih Bukhari (Hadith 2803):
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "By Him in Whose Hands my soul is! Whoever is wounded in Allah's Cause....and Allah knows well who gets wounded in His Cause....will come on the Day of Resurrection with his wound having the color of blood but the scent of musk
Reference: Bukhari 2803