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Smith's Bible Dictionary
Sackcloth. 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, and 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. https://www.studylight.org/dictionaries/eng/sbd/s/sackcloth.html. 1901.