The Prophet (saw) said: "The Believers, in their love, mutual kindness and close ties are like one body, when any part complains, the whole body responds to it in wakefulness and fever." (Muslim)
The Prophet (saw) said: "Whoever fulfils the needs of his brother, Allah will fulfil his needs; whoever removes the troubles of his brother, Allah will remove his troubles on the Day of Resurrection......." (Al-Bukhari and Muslim) http://uk.youtube.com/watch?v=oCMA4DoTzrE

