Narrated 'Abdullah bin Umar (Radhiallahu anhu):
Messenger of Allah (Sallallaahu 'alaihi wasallam) 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, and whoever screened a Muslim, Allah will screen him on the Day of Resurrection."
Sahih Bukhari - Volume 3, Book 43, Number 622.
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