6 Do not take a pair of millstones—not even the upper one—as security for a debt, because that would be taking a person’s livelihood as security.

Read Deuteronomy 24:6 Using Other Translations

No man shall take the nether or the upper millstone to pledge: for he taketh a man's life to pledge.
"No one shall take a mill or an upper millstone in pledge, for that would be taking a life in pledge.
“It is wrong to take a set of millstones, or even just the upper millstone, as security for a loan, for the owner uses it to make a living.