What does the Bible say about Jesus Christ as the cornerstone?

Ephesians 2:20 emphasizes that Jesus Christ Himself is the chief cornerstone of the church and the household of God. This imagery underscores His essential role as the foundation for all believers, emphasizing that without Him, there is no salvation. The prophets and apostles affirm this singular truth, as seen in Matthew 16:18, where Christ declares that He will build His church upon this rock, confirming that the gates of hell will not prevail against it. The foundation laid by Christ is eternal and unshakeable, bearing witness to the assurance of salvation and the unity of believers as they are built together in faith.