How do we know that Jesus is the foundation of the church?

The assertion that Jesus is the foundation of the church is rooted in both Old and New Testament teachings. Matthew 16:18 highlights Jesus as the rock, proclaiming, 'Upon this Rock will I build my church,' indicating that He is the essential cornerstone of the Christian faith. Furthermore, 1 Corinthians 3:11 reiterates, 'Other foundation can no man lay than that is laid, which is Jesus Christ.' This foundational belief is central to Reformed theology, emphasizing that salvation and the church's existence hinge solely upon Christ as the immovable Rock, safeguarding against the gates of hell.