What does the Bible say about the church being one assembly?

The concept of the church as one assembly is rooted in Scripture, particularly in Ephesians 4:4-6, where it highlights the oneness of the body of Christ through one Lord, one faith, and one baptism. This unity signifies that when individuals are called out by God, they are not merely separated from the world but are joined together in a collective purpose within the church. This assembly represents the body of believers who are unified in their mission to proclaim the gospel and engage in spiritual warfare together, emphasizing the importance of gathering as a community of faith.