'Master' in the Bible

And the [Babylonian] king told Ashpenaz, the chief of his officials, to bring in some of the sons of Israel, including some from the royal family and from the nobles,

There is a man in your kingdom in whom is a spirit of the holy gods; and in the days of your father, illumination, understanding and wisdom like the wisdom of the gods were found in him. And King Nebuchadnezzar, your father—your father the king, appointed him chief of the magicians, enchanters, Chaldeans and diviners.