'Millstones' in the Bible

and every firstborn in the land of Egypt will die, from the firstborn of Pharaoh who sits on his throne to the firstborn of the slave woman who [is] behind the pair of millstones and every firstborn animal.

"A person shall not take a pair of millstones or an upper millstone, for {he is taking necessities of life as a pledge}.

And I will exterminate from them the sound of jubilation, and the sound of joy, [the] voice of [the] bridegroom, and [the] voice of [the] bride, [the] sound of [the] millstones, and [the] light of [the] lamp.