The debate goes on as to whether the rapture will happen before the tribulation, in the middle, or at the end. In my wishful thinking and begging of God's mercy, I believe in a pre-tribulation rapture. People use lots of different scripture to back up there point of view, but I love Isaiah 26, which I believe foretells of the pre-tribulation rapture.
But your dead will live;
their bodies will rise.
You who dwell in the dust,
wake up and shout for joy.
Your dew is like the dew of the morning;
the earth will give birth to her dead.