Anyone who does not take the Mark of the Beast during the Tribulation period will pay for it with his head.
See Rev 20:4
I saw thrones on which were seated those who had been given authority to judge. And I saw the souls of those who had been beheaded because of their testimony for Jesus and because of the word of God. They had not worshiped the beast or his image and had not received his mark on their foreheads or their hands. They came to life and reigned with Christ a thousand years.
This proves that the Saved will be Raptured before this time period.