What does the Bible say about the Church of the Firstborn?

The Church of the Firstborn is mentioned in Hebrews 12:23, where it is described as the assembly of believers whose names are written in heaven. This denotes a special relationship between Christ, the Firstborn from the dead, and His elect people, emphasizing their identity and security in Him. The concept stresses that believers are part of a divine family, chosen before the foundation of the world to be heirs with Christ. Therefore, the church is not merely a local congregation but a spiritual body of all those united with Christ in faith and grace.