Musnad Abu Ya'la al-Mawsili 153:22

Abu Khaythama narrated to us, Sufyan ibn 'Uyaynah narrated to us, from Ma'mar, from al-Zuhri, from Salim, from his father, that the Messenger of Allah (ﷺ) said: "You will find the people like one hundred camels, in which there is not a single riding beast."