Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said that the Prophet (peace and blessings be upon him) said: "A Muslim is the brother of a Muslim: he does not wrong him, nor does he disgrace him. Whoever fulfils his brother's need, Allah fulfils his need; whoever relieves a Muslim of a hardship, Allah will relieve him of a hardship on the Day of Resurrection; and whoever conceals the faults of another Muslim, Allah will conceal his faults on the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأشربة والحد فيها / 17604