Sahih Muslim 2622
Sahih Muslim · Book 45: The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship · The Virtue Of The Weak And Downtrodden
Abu Huraira reported Allah's Messenger (may peace he upon him) as saying:
حَدَّثَنِي سُوَيْدُ بْنُ سَعِيدٍ ، حَدَّثَنِي حَفْصُ بْنُ مَيْسَرَةَ ، عَنِ الْعَلاَءِ بْنِ عَبْدِ الرَّحْمَنِ ، عَنْ أَبِيهِ ، عَنْ أَبِي هُرَيْرَةَ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " رُبَّ أَشْعَثَ مَدْفُوعٍ بِالأَبْوَابِ لَوْ أَقْسَمَ عَلَى اللَّهِ لأَبَرَّهُ " .
Many a person with disheveled 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.