Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Every wound that a Muslim receives in the way of Allah will be, on the Day of Resurrection, in the same state as when it was inflicted, flowing; its colour will be like blood and its scent like musk."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18529