Musnad Ahmad 937:205

Yahya ibn Sa'id narrated to us, from Yahya ibn Sa'id, Abu Salih narrated to me, from a man from Banu Asad, from Abu Dharr, that the Prophet, peace and blessings of Allah be upon him, said: "Indeed, the most intense of my nation in love for me are a people who will be, or will come, after me. One of them would wish that he had given his family and his wealth, and that he had seen me."