The meaning of Sackcloth in the Bible
(From Easton's Bible Dictionary)
cloth made of black goats' hair, coarse, rough, and thick, used for sacks, and also worn by mourners (Genesis 37:34; 42:25; 2Sam. 3:31; Esther 4:1,2; Psalms 30:11, etc.), and as a sign of repentance (Matthew 11:21). It was put upon animals by the people of Nineveh (Jonah 3:8).
See more on the meaning of Sackcloth in the Bible:
Sackcloth {International Standard Bible Encyclopedia}
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