"But immediately after the tribulation of those days the sun will be darkened, and the moon will not give its light, and the stars will fall from the sky, and the powers of the heavens will be shaken. “And then the sign of the Son of Man will appear in the sky, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of the sky with power and great glory. “And He will send forth His angels with a great trumpet and they will gather together His elect from the four winds, from one end of the sky to the other." [Matthew 24:29-31 NASB]
There are a couple of things to keep in mind when reading this passage. First, it is intended to prepare Jesus' disciples (which includes us) for the end times. Jesus isn't giving us any information that doesn't pertain to us. Second, everything that happens in this passage happens after the Tribulation.
He said, "they will gather together His elect from the four winds," which is an apt description of the rapture.
I know there are some churches that don't teach about the rapture, or deny that it is in the Bible. Lets look at a couple of verses.
"For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord, will not precede those who have fallen asleep. For the Lord Himself will descend from heaven with a shout, with the voice of the archangel and with the trumpet of God, and the dead in Christ will rise first. Then we who are alive and remain will be caught up together with them in the clouds to meet the Lord in the air, and so we shall always be with the Lord. Therefore comfort one another with these words." [1 Thessalonians 4:15-18 NASB]
"Behold, I tell you a mystery; we will not all sleep, but we will all be changed, in a moment, in the twinkling of an eye, at the last trumpet; for the trumpet will sound, and the dead will be raised imperishable, and we will be changed." [1 Corinthians 15:51-52 NASB]
So the concept of being changed in a moment, and caught up to meet the Lord in the air is a scriptural teaching. As for the word "rapture", it is not found in most English translations. It is a theological term derived from the Latin "raptura", and means, "to be caught up" (see 1 Thessalonians 4:17).
One of the big questions regarding the rapture is, "when will it happen?" The three main schools of thought are pre-trib, mid-trib, and post-trib. Meaning we will be caught up to meet Jesus either before, during, or after the tribulation.
Paul wrote:
"Now we request you, brethren, with regard to the coming of our Lord Jesus Christ and our gathering together to Him, that you not be quickly shaken from your composure or be disturbed either by a spirit or a message or a letter as if from us, to the effect that the day of the Lord has come. Let no one in any way deceive you, for it will not come unless the apostasy comes first, and the man of lawlessness is revealed, the son of destruction, who opposes and exalts himself above every so-called god or object of worship, so that he takes his seat in the temple of God, displaying himself as being God." [2 Thessalonians 2:1-4 NASB]
This is a description of the abomination of desolation that Jesus mentioned earlier in the chapter. The man of lawlessness is the Antichrist. We know from Daniel's prophecies that this event takes place in the middle of the seven years, and that the rapture will take place after this event.
I think one of the stumbling blocks to understanding is the definition of "the great tribulation". Many, if not most, evangelical preachers define the tribulation as encompassing the entire seven year period of Daniel's prophecy. I disagree.
The seven years will begin with a treaty that will bring unprecedented peace to the Middle East. In the middle of the seven years, the man of lawlessness will be revealed, "then" Jesus says, "there will be a great tribulation, such as has not occurred since the beginning of the world until now, nor ever will." [Matthew 24:21 NASB]
How long will the tribulation last? I don't know. Long enough for many Christians to be martyred. There is a passage in Revelation that mirrors Jesus' words.
"I looked when He broke the sixth seal, and there was a great earthquake; and the sun became black as sackcloth made of hair, and the whole moon became like blood; and the stars of the sky fell to the earth, as a fig tree casts its unripe figs when shaken by a great wind. The sky was split apart like a scroll when it is rolled up, and every mountain and island were moved out of their places. Then the kings of the earth and the great men and the commanders and the rich and the strong and every slave and free man hid themselves in the caves and among the rocks of the mountains; and they said to the mountains and to the rocks, “Fall on us and hide us from the presence of Him who sits on the throne, and from the wrath of the Lamb; for the great day of their wrath has come, and who is able to stand?”" [Revelation 6:12-17 NASB]
1 Thessalonians says that the Lord will appear to catch us up to be with Him. In this Revelation passage people are hiding in caves and under rocks (bad idea during an earthquake) to hide themselves from the the presence of the Lord.
Immediately after, in chapter seven, we are told, "After these things I looked, and behold, a great multitude which no one could count, from every nation and all tribes and peoples and tongues, standing before the throne and before the Lamb, clothed in white robes, and palm branches were in their hands;" [Revelation 7:9 NASB] Then, "These are the ones who come out of the great tribulation, and they have washed their robes and made them white in the blood of the Lamb." [Revelation 7:14 NASB]
While the rapture event is not described in Revelation, the tribulation saints appear in Heaven immediately after the events that mirror Jesus' description.
Revelation goes on to describe the wrath of God poured out on the earth, until Jesus comes again. The tribulation has ended, and the wrath of God has begun.
To summarize, the rapture is an event prophesied in the Bible. I believe it will take place after the tribulation, at some unknown time after the mid-point of Daniels's 70th week of years, and before the wrath of God is poured out on the earth.
A Christians, we need to be prepared for the Lord's return. We also need to be prepared to endure tribulation and die for His sake. Even now, there are many Christians in the world who are being persecuted for their faith, to the point of death. They are choosing to die, rather than give up their faith in Jesus. Would we do the same? Let us ask ourselves, seeking the Lord, "Is my faith strong enough to face persecution and death?"