A Mill Or Millstone May Not Be Taken In Pledge (Deuteronomy 24:6).
‘ No man shall take the mill or the upper millstone to pledge, for he takes a man's life to pledge.'
The next case of fair dealing and consideration consisted of when a pledge was taken for a loan. Such a pledge must never be a man's mill, or the detachable upper millstone. To take either would be to take away the man's ability to prepare his food. This was probably the small mill that each household would have in order to grind the unmilled grain. By taking this the creditor would be taking the man's very life. This must never happen.