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.
Berean Standard Bible
No man shall take the nether or the upper millstone to pledge: for he taketh a man’s life to pledge.
No man shall take the mill or the upper millstone as a pledge, for he takes a life in pledge.