The Apostle Paul tells us that the Rapture will happen suddenly (but not necessarily imminently): the dead in Messiah will rise first, then those Believers who are alive will arise to meet Him in the air.
Yeshua foretold the sequence of events leading up to the Rapture in His Olivet Discourse in Matthew 24; John confirmed this same sequence in Revelation 6 & 7: False Messiahs, Wars, Famine, Pestilence and Christian Martyrs are followed by Cosmic Signs (Genesis 1:14). And then shall come the Sealing of the 144,000 Messianic Believers from all 12 Tribes (Rev 7:1-8) and then the rapture of the remaining Believers (Rev 7:9-17).
Many are teaching today that the Rapture occurs in Revelation 4:1 – before all of this tribulation happens. But this does not fit the sequence of events that Yeshua told His Disciples nor the sequence of events that John witnessed in Revelation 6 & 7.
This can be a very painful realization that we Believers will experience tribulation before Yeshua comes for His Bride (us!). As we continue our study, we will explore many verses that support this.