The Messenger of Allah ﷺ said, "A Muslim is the brother of another Muslim. He does not wrong him, nor does he abandon him. Whoever attends to the need of his brother, Allah will attend to his need. Whoever relieves a Muslim of a hardship, Allah will relieve him of one of the hardships of the Day of Resurrection. Whoever conceals the faults of a Muslim, Allah will conceal his faults on the Day of Resurrection."
أن رسول الله ﷺ 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.
Narrated by Bukhari in the chapter on injustices (2442), and Muslim in the chapter on righteousness and kinship (2580:58), both through various routes from Layth, from Aqeel, from Zuhri, from Salim, from his father, who said, and then mentioned it.