Theonas of Alexandria: The Epistle of Theonas, Bishop of Alexandria, to Lucianus, the Chief Chamberlain 6Chapter VI.

VI. In a similar manner should he conduct himself to whose fidelity are entrusted the vessels of silver and gold, and crystal or murrha, for eating or for drinking. All these he should arrange suitably, of them all he should keep an account, and with all diligence he should make an inventory of how many and which sort of precious stones are in them. He should examine them all with great prudence; he should produce them in their proper places and on their proper occasions. And he should observe most carefully to whom he gives them, and at what time, and from whom he receives them again, lest there should occur any mistake or injurious suspicion, or perhaps some considerable loss in things of value.