During the last part of the Tribulation, the only people who suffer are the ones who took the Mark of the Beast. A really definitive time in that period. During the last years, believers will be sheltered in (so it is believed) Petra, the Rose Red City. The Beast will attack, but be repelled. It’ll be the one and only safe place for Christians. Christians will live there from the time of the Abomination of Desolation (the complete desecration of the reconstructed Temple) and then from then out it’ll only be a matter of time until Armageddon. Then the Great Appearance and thousand years/Millennium. Then the Devil will be loosed and then eternally cast into the Lake of Fire. From then on out, Eternal Life.
>> “During the last part of the Tribulation, the only people who suffer are the ones who took the Mark of the Beast.” <<
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No, they will suffer after the trib. They are among those against whom Yeshua will make war on his return to Earth.
Only Yehova’s elect will suffer in the trib. It is Satan that does the tribulating.