Sahih Muslim
The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fadail Al-Sahabah)
Book Number: 031 / Hadith Number: 6179
Ibn 'Umar reported Allah's Messenger (may peace be upon him) as saying: You would find people like one hundred camels and you would not find even one (camel) fit for riding.