36 “But of that day and hour no one knows, not even the angels of heaven, but My Father only.
37 But as the days of Noah were, so also will the coming of the Son of Man be.
38 For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark,
39 And did not know until the flood came and took them all away, so also will the coming of the Son of Man be.
40 Then two men will be in the field: one will be taken and the other left.
41 Two women will be grinding at the mill: one will be taken and the other left.
42 Watch therefore, for you do not know what hour your Lord is coming.
43 But know this, that if the master of the house had known what hour the thief would come, he would have watched and not allowed his house to be broken into.
44 Therefore you also be ready, for the Son of Man is coming at an hour you do not expect.
watch (v.42) = be continuously on guard
Christ likened those future days in which the signs will unfold to the days of Noah (vs. 37-39). Noah announced a coming judgment and offered people a way of escape from it. However, people ignored Noah’s warnings of judgment and went on occupying themselves with their normal course of life. They were “eating and drinking, marrying and giving in marriage” (vs.38) right up until the very day Noah entered the ark. — Pentecost, page 405
__________
According to Matthew 24:40-41, “Then shall two be in the field; the one shall be taken, and the other left. Two women shall be grinding at the mill; the one shall be taken, and the other left.” Because at the rapture believers will be taken out of the world, some have confused this with the rapture of the Church.
Here, however, the situation is the reverse. The one who is left, is left to enter the kingdom; the one who is taken, is taken in judgment. This is in keeping with the illustration of the time of Noah when the ones taken away are the unbelievers. The word for “shall be taken” in verses 40-41 uses the same word found in John 19:16, where Christ was taken away to the judgment of the cross. — Walvoord, pages 193-194
__________