Sahih Muslim Book 32, Hadith Number 6351.

Chapter : The merits of the weak and downtrodden people.

Abu Huraira reported Allah’s Messenger (may peace he upon him) as saying: Many a person with unshaved hair and covered with dust is turned away from the doors (whereas he is held in such a high esteem by Allah) that if he were to adjure in the name of Allah (about anything) Allah would fulfil that.