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Who was Oved Edom?
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Rashi: He was a Levi 1 , like it says in Divrei ha'Yamim I, 15:18. He was a gatekeeper. Radak (11) - he also sang (Divrei ha'Yamim I, 15:21). He is called Giti, for he was from Gas.
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Malbim - it was proper for a Levi to stand in front of the Aron.