Abu Dawud
General Behavior
Book Number: 036 / Hadith Number: 4825
Narated By AbuMusa al-Ash'ari : The Prophet (pbuh) said: Glorifying Allah involves showing honour to a grey-haired Muslim and to one who can expound the Qur'an, but not to one who acts extravagantly regarding it, or turns away from it, and showing honour to a just ruler.