The Canons of the Synods of Sardica, Carthage, Constantinople, and Carthage Under St. Cyprian, Which Canons Were Received by the Council in Trullo and Ratified by II. Nice 60Canon XXXVII.

It is not lawful to offer anything in the Holy Mysteries except bread and wine mixed with water.

In the sacraments of the body and blood of the Lord nothing else shall be offered than that which the Lord himself ordained, that is to say, bread and wine mixed with water. But let the first-fruits, whether honey or milk, be offered on that one most solemn day, as is wont, in the mystery of the infants. For although they are offered on the altar, let them have nevertheless their own benediction, that they may be distinguished from the sacraments of the Lord's body and blood; neither let there be offered as first-fruits anything other than grapes and corns.