Mill: Upper and Lower Stones of
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Deuteronomy 24:6
Do not take a pair of millstones or even an upper millstone as security for a debt, because that would be taking one’s livelihood as security.
Job 41:24
His chest is as hard as a rock, as hard as a lower millstone!
Isaiah 47:2
Take millstones and grind flour; remove your veil; strip off your skirt, bare your thigh, and wade through the streams.