Canon 50
The order for clergy to celebrate the Sacrament of the Eucharist on an empty stomach.
Let the sacrament of the altar be performed only by those who have not eaten anything, with the exception of 1 day in the year on which the Lord's Supper is celebrated. If there is a commemoration of someone, whether bishops or others, who died in the evening, then let it be done with only prayers, if it turns out that those performing it have already tasted food.
Greek original
Ὥστε ἅγια θυσιαστηρίου, εἰ μὴ ἀπὸ νηστικῶν ἀνθρώπων, μὴ ἐπιτελεῖσθαι, ἐξῃρημένης μιᾶς ἐτησίας ἡμέρας, ἐν ᾗ τὸ Κυριακὸν δεῖπνον ἐπιτελεῖται. Ἐὰν δέ τινων κατὰ τὸν δειλινὸν καιρὸν τελευτησάντων εἴτε ἐπισκόπων, εἴτε τῶν λοιπῶν, παράθεσις γένηται, μόναις εὐχαῖς ἐκτελεσθῇ, ἐὰν οἱ ταύτην ποιοῦντες ἀριστήσαντες εὑρεθῶσι.[1]
Parallel canons
Ап.69Трул.29Лаод.50Антиох.1Карф.47Тимоф.16