Maliks Muwatta Book 21, Hadith Number 29.

Yahya related to me from Malik from Abu’z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, “By He in whose hand my self is! None of you is wounded in the way of Allah – and Allah knows best who is wounded in HisWay, but that when the Day of Rising comes, blood will gush forth from his wound. It will be the colour of blood, but its scent will be that of musk.”