The meaning of Dust in the Bible
(From Easton's Bible Dictionary)

Storms of sand and dust sometimes overtake Eastern travellers. They are very dreadful, many perishing under them. Jehovah threatens to bring on the land of Israel, as a punishment for forsaking him, a rain of "powder and dust" (Deuteronomy 28:24).

See more on the meaning of Dust in the Bible:
Dust {International Standard Bible Encyclopedia}

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