What is the coming new body for believers part of?
It is part of the complete redemption described in Ephesians chapter 1. Believers await the redemption of the body, while the soul and spirit are already redeemed; the Holy Spirit is the earnest of our inheritance until the redemption of the purchased possession.
Les explains that the day is coming when believers will have a new body, and it is part of the complete redemption in Ephesians chapter 1. In Ephesians 1:14, the sealing of the Holy Spirit is the earnest, the down payment, of our inheritance until the redemption of the purchased possession. He notes that while God has already redeemed the soul and spirit, what is waiting is the redemption of the body. Romans chapter 8 likewise shows everything moving to the day of that final redemption of the body, when believers will be a complete entity, ready to go into all eternity.