Hazrat Abdullah bin Umar (may Allah be pleased with them) narrated that the Messenger of Allah (peace and blessings be upon him) said: A Muslim is a brother to another Muslim, so he should not oppress him nor let him be oppressed. Whoever fulfills the need of his brother, Allah will fulfill his need. Whoever removes a calamity from a Muslim, Allah will remove one of the great calamities of the Day of Resurrection from him. And whoever conceals the faults of a Muslim, Allah will conceal his faults on the Day of Resurrection.