This song or Nasheed known in arabic is one of the famous muslim medieval songs from the 10th or the 11th century, muslims use to sing this when they were going in to other lands out of middle east, it really gives you a feeling how they felt, leaving their families behind for God and spreading the faith, eventhough this is in arabic, i am sure you will like it, early arabic was indeed a really beautiful and sweet language, please listen:
http://www.youtube.com/watch?v=W-78oMM7yjA&feature=player_embedded