Abu Hurairah (Ra) narrates that Rasúlullãh (saw) said: If anyone removes one of the anxieties of a distressed person in this world, Allãh will remove one of the anxieties of the Hereafter from him. If anyone conceals a faults of a Muslim, Allãh will conceal his faults in the Hereafter. Allãh keeps helping a man, so long he keeps helping his brother.

(Musnad Ahmad)