Musnad Ahmad 30:1086

The Messenger of Allah, may Allah bless him and grant him peace, said: "Every wound that a Muslim receives in the way of Allah will come on the Day of Resurrection in the same state as it was when it was inflicted, gushing with blood; its color will be the color of blood, and its scent will be the scent of musk." Abdullah ibn Ahmad said: My father said: "Meaning: the 'urf' is the scent."