Who makes up the Body of Christ in the resurrection order?

The Body of Christ is made up of those who have been saved during this age of grace. In the resurrection order, they form the main harvest that comes after Christ and the firstfruits, and before the Old Testament saints and tribulation saints are raised.

Les explains from I Corinthians 15:23 that every man is resurrected in his own company or order. Christ and the firstfruits form the first group. Then comes the main harvest, which Les identifies as the Body of Christ—those saved during this age of grace. After the tribulation runs its course and an extra 75 days pass, the Old Testament saints, including Daniel and all the rest, along with the tribulation saints, will be resurrected in their company.

1 Corinthians 15:23

But every man in his own order: Christ the firstfruits; afterward they that are Christ’s at his coming.

Who were the first group of resurrection people?

According to 1 Corinthians 15:23, the first group of resurrection people is Christ and the firstfruits. They form the first company in God's ordered resurrection. After them comes the main harvest, identified as the Body of Christ, those saved during the age of grace.