Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) reported that the Messenger of Allah (peace and blessings be upon him) said: "A Muslim is the brother of a Muslim; he does not wrong him, nor does he abandon him. Whoever helps his brother, Allah Almighty helps him. Whoever relieves a Muslim of a hardship, Allah Almighty will relieve him of the hardships of the Day of Resurrection, and whoever conceals the faults of a Muslim, Allah Almighty will conceal his faults on the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12128