Mukhtasar Muslim

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: A Muslim is the brother of a Muslim; so he should neither oppress him nor abandon him to destruction. Whoever is engaged in fulfilling the need of his brother, Allah will be engaged in fulfilling his need; and whoever removes a calamity from a Muslim, Allah will remove from him one of the calamities of the Day of Resurrection; and whoever conceals the faults of a Muslim, Allah will conceal his faults on the Day of Resurrection.