What does the Bible say about Zion as the city of God?

In Psalm 87, Zion is depicted as the city of God, where He expresses His love for His people and which serves as the foundation for His universal church. This city, also referred to as the holy mountain, signifies the glory and grandeur belonging to the church of our Lord Jesus Christ. It illustrates God's eternal plan, revealing that all believers are part of this city, bonded by Christ's redemptive work. Zion's significance is rooted in its divine foundation, established by God before the world's creation, emphasizing that the true essence of Zion is not solely its local manifestations but its universal nature as God's habitation.