Musnad Ahmad 32:828

Muhammad ibn Ja‘far narrated to us, Shu‘bah informed us, and Hajjaj said: Shu‘bah narrated to me, from Qatadah, who said: I heard Anas ibn Malik narrating from the Prophet, peace and blessings of Allah be upon him, that he said: "There is no one who enters Paradise who would like to return to the world, even if he were to have everything that is on the earth, except for the martyr. For he wishes to return so that he may be killed ten times, because of what he sees of the honor."