Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Whatever Muslim man fights in the way of Allah for as long as the interval of milking a she-camel, Paradise becomes obligatory for him. Whoever sincerely asks Allah Almighty for martyrdom, then dies or is killed in the way of Allah, will receive the reward of martyrdom. Whoever is wounded in the way of Allah or suffers some calamity, when he comes on the Day of Resurrection, it (the wound) will be flowing more copiously than it ever was; its colour will be like saffron and its scent like musk. And whoever goes out in the way of Allah will bear the seal of the martyrs."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18556