Musnad Ahmad 32:63

'Amr ibn al-Haytham Abu Qatan narrated to us, Shu'bah narrated to us, from Qatadah, from Anas, from the Prophet, peace and blessings of Allah be upon him, who said: "There is no one who enters Paradise and would like to return to the world, even if he were to have everything that is on the earth, except for the martyr. He would like to return and be killed, because of what he sees of the honor." Or [he said] the meaning thereof.