'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.

the people have turned aside and gathered it, and ground it with millstones, or beat it in a mortar, and boiled it in a pan, and made it cakes, and its taste hath been as the taste of the moisture of oil.

“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 the millstones, and grind meal: uncover thy locks, make bare the leg, uncover the thigh, pass over the rivers.

Moreover I will take from them the voice of mirth, and the voice of gladness, the voice of the bridegroom, and the voice of the bride, the sound of the millstones, and the light of the candle.

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