cloth used in making sacks or bags, a coarse fabric, of a dark color, made of goat’s hair, (Isaiah 50:3; Revelation 6:12) end resembling the eilicium of the Romans. It, was used also for making the rough garments used by mourners, which were in extreme cases worn next the skin. (1 Kings 21:27; 2 Kings 6:30; Job 16:15; Isaiah 32:11)
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Smith, William, Dr. "Entry for 'Sackcloth,'". "Smith's Bible Dictionary".