Musnad Ahmad 1077:2

Yazid ibn Harun narrated to us, Muhammad ibn Ishaq informed us, from al-Zuhri, from Abdullah ibn Tha'labah ibn Su'ayr, who said: When the Messenger of Allah, peace and blessings of Allah be upon him, looked over the martyrs of Uhud, he said: "I bear witness for these: there is no one wounded who is wounded for the sake of Allah, except that Allah will resurrect him on the Day of Resurrection while his wound is bleeding; the color is the color of blood, and the scent is the scent of musk. Look at those among them who had gathered the most Quran, and place them in front in the grave."