“O Aktham! Fight alongside
people other than your own, it will improve your attitude and make
you
generous to your companions. O Aktham, the best number of
companions
is four, the best number of troops on an expedition is
four hundred,
the best number of an army is four thousand, and twelve
thousand will
never be overpowered because of their small number.”
Sunan Ibn Majah Book 24, Hadith 75