SAHIH MUSLIM....

Salim(RA) reported on the authority of his father

that Allah’s Messenger (may peace be upon him) said:

A Muslim is the brother of a fellow-Muslim.

He should neither commit oppression upon him

nor ruin him,

and he who meets the need of a brother,

Allah would meet big needs,

and he who relieved a Muslim from hardship

Allah would relieve him from the hardships

to which he would be put on the Day of Resurrection,

and he who did not expose (the follies of a Muslim) Allah would conceal his follies

on the Day of Resurrection.

Sahih Muslim (Book #032, Hadith#6250)