The Mid-tribulational Rapture Theory
From: The End, by Norman B. Harrison p. 75.
St. Paul, by inspiration of the Spirit, definitely places the Resurrection and the Rapture of the saints through the coming of Christ “at the last trumpet” (1 Corinthians 15:5,52). This is a specific locating of the event. Unquestionably the Holy Spirit revealed the fact and inspired the recording of it. How dare any one locate it otherwise?…Can we postulate the Rapture at any other place than that given by and through the Apostle Paul and claim to maintain the integrity of God’s Word?
One supporter of this view prefers that it be called the “midseventieth week theory of the Rapture,” noting that his view “is popularly known as the midtribulational theory, but such a term gives rise to a possible misunderstanding.” Those who believe that only the second half of Daniel’s seventieth week (three and a half years) is the time of tribulation would see themselves as really advocating a pretribulational rapture of the church.
Understanding End Times Prophecy, p 216.
51 Behold, I tell you a mystery; we shall not all sleep, but we shall all be changed,
52 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 shall be changed.
53 For this perishable must put on the imperishable, and this mortal must put on mmortality.
-1 Corinthians 15:51-53