عن سالم عن أبيه أن رسول الله صلى الله عليه وسلم قال المسلم أخو المسلم لا يظلمه ولا يسلمه من كان في حاجة أخيه كان الله في حاجته ومن فرج عن مسلم كربة فرج الله عنه بها كربة من كرب يوم القيامة ومن ستر مسلما ستره الله يوم القيامة ( صحيح مسلم #2580 )

Saalim (rahimahullah) narrates from his father that Rasulullah (sallallahu ‘alaihi wasallam) said, “A Muslim is the brother of his fellow Muslim. He will thus neither oppress him nor forsake and abandon him. Whoever sees to the need of his Muslim brother, Allah Ta‘ala will fulfill his need and whoever relieves his Muslim brother of some difficulty, Allah Ta‘ala, in lieu of this, will relieve him of a great difficulty from the difficulties of the Day of Qiyaamah. Whoever conceals the fault (and sin) of his Muslim brother, Allah Ta‘ala will conceal his faults (and sins) on the Day of Qiyaamah.”