Where else does the Bible describe the great tribulation in Revelation?
The great tribulation is also described in the book of Revelation, specifically through the trumpet judgments and the bowl judgments. These judgments depict the same period of great tribulation that Jesus spoke of in Matthew 24:21. The context connects them as end-time events.
Les explains that the great tribulation Jesus describes in Matthew 24:21 is picked up in the book of Revelation through the trumpet judgments and the bowl judgments. He notes that verse 22 says those days will be shortened, not from three and a half years to three, but that the period will end right on schedule, not going an hour over. He adds that if it went even 24 or 48 hours longer, no flesh could be saved, but for the elect's sake—the believers, Jew or Gentile.
For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.