The nether or the upper millstone. — Literally, the two millstones, or even the upper one.
A man’s life. — Literally, a soul. This word connects the two verses (6, 7).
Related Commentaries of Deuteronomy 24:6
Deuteronomy 24:6
6 No man shall take the nether or the upper millstone to pledge: for he taketh a man's life to pledge.