Roman Catechism 21.37

Chapter 21 — Part II: The Sacraments — Holy Orders

Section 37. How great was the dignity of this order in the ancient Church may be inferred from a usage which exists in the Church in these times. For the office of treasurer, which is still numbered among the more honourable functions of the Church, was entrusted to porters, and carried with it also the guardianship of the sacristy.