The Book on Government (Kitab Al-Imara)

Muslim :: Book 20 : Hadith 4559

It has been narrated on the authority of Ibn 'Abbas that the messenger of Allah (may peace be upon him) said: One who found in his Amir something which he disliked should hold his patience, for one who separated from the main body of the Muslims even to the extent of a handspan and then he died would die the death of one belonging to the days of Jahiliyya.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star