It will happen suddenly, quicker than the blink of an eye. At the sound of the last trumpet the dead will be raised. We will all be changed, so that we will never die again.
You were asking for a prophet the day you were gathered at Mount Sinai and said to the LORD, "Please don't let us hear your voice or see this terrible fire again--if we do, we will die!"
With a loud command and with the shout of the chief angel and a blast of God's trumpet, the Lord will return from heaven. Then those who had faith in Christ before they died will be raised to life.
Make sure that you obey the one who speaks to you. The people did not escape, when they refused to obey the one who spoke to them at Mount Sinai. Do you think you can possibly escape, if you refuse to obey the one who speaks to you from heaven?