What does the Bible say about Gentiles being fellow heirs?

Ephesians 3:5-6 reveals that in previous generations, the knowledge of God's plan of salvation was not made known to humanity. However, following the death and resurrection of Jesus, the Gospel was unveiled to His apostles and prophets by the Holy Spirit, affirming that Gentiles are now fellow heirs, partakers of the promise in Christ. This signifies a monumental shift in God's redemptive plan, allowing all nations to be included in His covenant community, a truth that is foundational to sovereign grace theology. Such inclusion is a demonstration of the grace of God and underscores the universal scope of the Gospel.