2 Corinthians 5:4 For we that are in this tabernacle do groan, being burdened: not for that we would be unclothed, but clothed upon, that mortality might be swallowed up of life.

When a believer dies, his soul returns to heaven with God and his body is buried and consigned to the ground. This is called the Intermediate State. When Jesus returns, He will fashion a new body for that soul.