Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said 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 forsake him. Whoever is engaged in helping his brother, Allah Almighty is engaged in helping him; whoever removes a distress from a Muslim, Allah Almighty will remove from him (a distress from) the distresses of the Day of Resurrection; and whoever covers (the faults of) a Muslim, Allah Almighty will cover him on the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الغصب / 11512