Council of Chalcedon, Canon XXVI

Forasmuch as we have heard that in certain churches the bishops managed the church-business without stewards, it has seemed good that every church having a bishop shall have also a steward from among its own clergy, who shall manage the church business under the sanction of his own bishop; that so the administration of the church may not be without a witness; and that thus the goods of the church may not be squandered, nor reproach be brought upon the priesthood; and if he [i.e., the Bishop] will not do this, he shall be subjected to the divine canons.

Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.