Jabir: The Messenger of Allah (saas) wished to go on campaign, and said: "O COMMUNITY OR MIGRANTS AND EMIGRANTS! Some of your brothers have neither possessions nor tribe. LET EACH ONE OF YOU TAKE TWO OR THREE SUCH PEOPLE ALONGSIDE THEM." (Jabir then goes on to say): "At this I took two or three people along with me. (Throughout the journey) for my camel, I had a queue of people (riding) like that of the others."
(Al-Kutub al-Sitta, hadith no: 2192)