Musannaf Ibn Abi Shayba 11:204

Khalid ibn Makhlad narrated to us, from Abd al-Rahman ibn Abd al-Aziz, [who said] al-Zuhri narrated to us, from Abd al-Rahman ibn Ka'b ibn Malik, from his father, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There is no wounded person who is wounded in the way of Allah, except that his wound will come on the Day of Resurrection bleeding; its color is the color of blood, and its scent is the scent of musk." "Present the one among the people who has the most [knowledge of the] Quran, and place him in the *lahd* (niche of the grave)."