'Millstones' in the Bible

and every firstborn male in the land of Egypt will die, from the firstborn of Pharaoh who sits on his throne to the firstborn of the servant girl who is behind the millstones, as well as every firstborn of the livestock.

“Do not take a pair of millstones or an upper millstone as security for a debt, because that is like taking a life as security.

Take millstones and grind meal;remove your veil,strip off your skirt, bare your thigh,wade through the streams.

I will eliminate the sound of joy and gladness from them—the voice of the groom and the bride, the sound of the millstones and the light of the lamp.

Young men labor at millstones;boys stumble under loads of wood.