Mukhtasar Bukhari

Narrated by Sayyiduna Ibn Abbas (may Allah be pleased with them both) from the Messenger of Allah (peace and blessings be upon him) that he said: "Whoever sees something he dislikes in his leader (i.e., ruler or king), let him be patient, for whoever separates himself from the ruler even by a handspan will die the death of ignorance." (Sayyiduna Ibn Abbas [may Allah be pleased with them both]) in another narration says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever sees something he dislikes in his ruler should be patient, for whoever separates from the congregation even by a handspan and then dies, he will die the death of ignorance."