“Then will two men be in the field; one is taken, and one is left. Two women will be grinding at the mill; one is taken, and one is left.”
And in the same way when the Son of Man comes two men will be working together in the field, and two women will be working at their handmills at home, and in each case one will be ‘taken away'. This may signify ‘to judgment' (compare Matthew 13:30; Matthew 13:41; Matthew 13:49), while the other will be left to be caught up to meet their Lord in the air (1 Corinthians 15:52; 1 Thessalonians 4:18), or it may mean ‘taken to be with the Lord, with the other remaining or judgment. (Dogmatism is ruled out, for all descriptions of what will happen on the final day of judgment are in picture form. Consider the different descriptions of the final judgment in the Book of Revelation (e.g. Revelation 6:12-17; Revelation 11:14-18; Revelation 14:14-20; Revelation 16:17-21; Revelation 19:11-21; Revelation 20:11-15). All will be essentially true, but the reality will be unlike all. All are picture of a greater reality, in the same way as in the Old Testament prophets. God is not subject to the vagaries of time or a physical world).
The men would be working in the fields producing food for their daily fare, while the women would grind the produce at home in their small hand mills, thus enabling all of them to eat and drink (compare Matthew 24:39, ‘eating and drinking'). The picture is a homely one of married couples keeping the household going (again compare Matthew 24:39, marrying and giving in marriage). Note that in both cases their judgment is not said to be based on their sinfulness (although of course it is), but on the fact that they simply ignored the Son of Man and the need to be ready for Him. Their final sin was that they had ignored God's remedy.