The Messenger of Allah ﷺ said, "A Muslim is the brother of another Muslim. He does not wrong him, nor does he hand him over to an enemy. Whoever attends to the needs of his brother, Allah will attend to his needs. 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."
حدثنا قتيبة حدثنا الليث عن عقيل عن الزهري
أن رسول الله ﷺ قال المسلم أخو المسلم لا يظلمه ولا يسلمه ومن كان في حاجة أخيه كان الله في حاجته ومن فرج عن مسلم كربة فرج الله عنه كربة من كرب يوم القيامة ومن ستر مسلما ستره الله يوم القيامة
Bukhari also narrated it in the Chapter on Duress, in the Section on a Man's Oath to His Companion That He Is His Brother When He Fears He May Be Killed or Something Similar, hadith 6951, 2442, from the hadith of Layth bin Saad, through the same chain.