Musnad Ahmad 937:167

Yazid narrated to us, al-Walid ibn Jami' al-Qurashi informed us, Abu al-Tufayl 'Amir ibn Wathilah narrated to us, from Hudhayfah ibn Asid, who said: Abu Dharr stood up and said: "O Banu Ghifar, speak and do not differ, for the truthful, the believed [the Prophet] narrated to me: 'That people will be gathered into three groups: a group riding, eating, and clothed; a group walking and running; and a group whom the angels will drag upon their faces and gather into the Fire.'" A speaker among them said: "We have known these two, but what is the matter with those who walk and run?" He said: "Allah will cast a blight upon the mounts until no mount remains, to the extent that a man will have a delightful garden, and he will offer it in exchange for a lean she-camel with a saddle, yet he will not be able to obtain it."