Reference: Rab-mag
American
A general officer of Nebuchadnezzar's army, at the taking of Jerusalem, Jer 39:3. He was, as his name signifies, a chief of the magi; a dignitary who had accompanied the king of Babylon in his campaign. See MAGI.
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Hastings
The title of Nergal-sharezer, a Babylonian official present at the taking of Jerusalem (Jer 39:3,13). For various conjectures as to the origin of the title, see Hastings' Dictionary of the Bible, s.v. Tentatively adopting the oldest and most obvious account, that it means 'chief magus,' we note here that the name magus may very well have been applied to a sacred caste employed in Babylon long before it became associated with Zoroastrianism, to which the silence of the Avesta shows it was originally foreign. See Magi.
James Hope Moulton.