Musnad Ahmad 30:2903

'Abd al-Rahman narrated to us, Hammad narrated to us, from Muhammad, who said: I heard Abu Hurayrah saying: I heard Abu al-Qasim (may Allah bless him and grant him peace) saying: "While a man was walking, his hair and his two garments pleased him, when the earth swallowed him up. He will continue to sink into it until the Hour is established."