A.T. Robertson Commentary Matthew 24:41

"two women [shall be] grinding at the mill; one is taken, and one is left." — Matthew 24:41 (ASV)

At the mill (εν τω μυλω). So Westcott and Hort and not μυλων (millhouse) Textus Receptus. The millstone and then hand-mill which was turned by two women (αληθουσα) as in Ex 11:5. This verb is a late form for αλεω. There was a handle near the edge of the upper stone.