Millstone in the Bible

Not to be taken as a pledge

• Deuteronomy 24:6 No man shall take the nether or the upper millstone to pledge: for he taketh a man's life to pledge.

⇒Bible Encyclopedia for MILLSTONE.

Probably used in executions by drowning

• Matthew 18:6 But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.
• Mark 9:42 And whosoever shall offend one of these little ones that believe in me, it is better for him that a millstone were hanged about his neck, and he were cast into the sea.
• Luke 17:2 It were better for him that a millstone were hanged about his neck, and he cast into the sea, than that he should offend one of these little ones.

⇒Definition of millstone

Abimelech killed by one being of hurled upon him

• Judges 9:53 And a certain woman cast a piece of a millstone upon Abimelech's head, and all to brake his skull.

⇒"Mills" Bible Outline

Figurative of a hard heart

• Job 41:24 His heart is as firm as a stone; yea, as hard as a piece of the nether millstone.

⇒See also McClintock and Strong Cyclopedia for Millstone.