Sahih Bukhari Vol 003, Book 043, Hadith Num 622

Narated By 'Abdullah bin Umar : Allah's Apostle said, "A Muslim is a brother of another Muslim, so he should not oppress him, nor should he hand him over to an oppressor. Whoever fulfilled the needs of his brother, Allah will fulfill his needs; whoever brought his (Muslim) brother out of a discomfort, Allah will bring him out of the discomforts of the Day of Resurrection Whosoever covers (the sins of) a Muslim, Allah covers (his sins) on the Day of Judgment.