Commentaries:
Jamieson, Fausset, and Brown
grievous revolters—literally "contumacious of the contumacious," that is, most contumacious, the Hebrew mode of expressing a superlative. So "the strong among the mighty," that is, the strongest (Ezekiel 32:21). See Jeremiah 5:23; Hosea 4:16.
walking with slanders— (Jeremiah 9:4). "Going about for the purpose of slandering" [MAURER].
brass, etc.—that is, copper. It and "iron" being the baser and harder metals express the debased and obdurate character of the Jews (Isaiah 48:4; Isaiah 60:17).
Other Jamieson, Fausset, and Brown entries containing Jeremiah 6:28:
Isaiah 1:22
Isaiah 48:4
Isaiah 59:3
Jeremiah 5:23
Jeremiah 6:27
Jeremiah 9:4
Micah 2:3
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