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.

This scripture is usually used in connection to rapture yet rapture is not in the context. The context of this text is destruction of the disobedient and unbelievers not salvation in a rapture. It says that the wicked ones are taken away in destruction at the coming of the Son of man just like in the days of Noah. Please look at the underlined words below for a better perspective:

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.

It says, as in the time of Noah when the flood came and took away the wicked (see underlined words), also when Christ comes, what will follow will be the taking away of the wicked to different forms of destruction. Take note of the word "then" implying this happens after Christ has been revealed on the clouds. It is not at all referring to the taking away of the righteous.
It is also consistent with Paul's expounding on Jesus' words in the scripture below when he says:

1  But concerning the times and the seasons, brethren, you have no need that I should write to you. 2  For you yourselves know perfectly that the day of the Lord so comes as a thief in the night. 3  For when they say, "Peace and safety!" then sudden destruction comes upon them, as labor pains upon a pregnant woman. And they shall not escape.

Please mark the underlined words that bring out the same context of what Jesus said in the indicated scriptures.
Let us look for a second witness, given that Luke writes about the same:

28  So also [it was the same] as it was in the days of Lot. [People] ate, they drank, they bought, they sold, they planted, they built; 29  But on the [very] day that Lot went out of Sodom, it rained fire and brimstone from heaven and destroyed [them] all. 30  That is the way it will be on the day that the Son of Man is revealed... 34  I tell you, in that night there will be two men in one bed; one will be taken and the other will be left. 35  There will be two women grinding together; one will be taken and the other will be left. 36  Two men will be in the field; one will be taken and the other will be left. 37  Then they asked Him, Where, Lord? He said to them, wherever the dead body is, there will the vultures or eagles be gathered together.

When asked where they will be taken, He says being taken in this context means being mass killing without burial: wherever the dead body is, there will the vultures or eagles be gathered together.
There is a third witness who expounds on the meaning of the phrase about dead bodies and the eagles.

17  Then I saw an angel standing in the sun; and he cried with a loud voice, saying to all the birds that fly in the midst of heaven, "Come and gather together for the supper of the great God, 18  that you may eat the flesh of kings, the flesh of captains, the flesh of mighty men, the flesh of horses and of those who sit on them, and the flesh of all people, free and slave, both small and great."

The essence of it is that birds are summoned by angels to eat the flesh of the multitudes of people that will be killed in the camp of the antichrist and his armies when they decide to wage war against the Lord and his armies.
Thus to suggest that these scriptures refer to the rapture, and further use them to assert that some Christians will be taken while others left to go through the great tribulation is unfounded.