The theme of Pauls first letter to the Thessalonians is the Second Coming of Jesus Christ. It is important to understand that the Second Coming of Jesus Christ is not one event but a series of events. We will note how Paul encourages the Thessalonians with the coming rapture and physical second coming of the Lord Jesus Christ. Paul writes that the first thing to happen when the rapture of the church takes place is the dead in Christ shall rise first.
Scripture References: 1 Thessalonians 4:16-17