Catechism of the Catholic Church

In the consecratory prayer for ordination of deacons, the Church confesses: Almighty God... , You make the Church, Christ's body, grow to its full stature as a new and greater temple. You enrich it with every kind of grace and perfect it with a diversity of members to serve the whole body in a wonderful pattern of unity. You established a threefold ministry of worship and service, for the glory of your name. As ministers of your tabernacle you chose the sons of Levi and gave them your blessing as their everlasting inheritance.