Правило 19
About the rite of the ancient liturgy and the permission of only clergy to receive communion at the altar.
About the fact that after the conversations of the bishops, first, there should be a special prayer for the catechumens, and after the catechumens come out, a prayer for the penitents, and when the penitents come under the laying on of hands and leave, then perform 3 prayers of the faithful: the 1st in silence, the 2nd and 3rd - out loud, and then teach peace and, after the presbyters teach peace to the bishop, teach peace to the laity, and thus perform holy offering. And that only one clergy is allowed to enter the altar and receive communion there.
Greek original
Περὶ τοῦ δεῖν ἰδίᾳ πρῶτον, μετὰ τὰς ὁμιλίας τῶν ἐπισκόπων, καὶ τῶν κατηχουμένων εὐχὴν ἐπιτελεῖσθαι· καὶ μετὰ τὸ ἐξελθεῖν τοὺς κατηχουμένους, τῶν ἐν μετανοίᾳ τὴν εὐχὴν γίνεσθαι· καὶ τούτων προσελθόντων ὑπὸ χεῖρα καὶ ὑποχωρησάντων, οὕτω τῶν πιστῶν τὰς εὐχὰς γίνεσθαι τρεῖς, μίαν μὲν τὴν πρώτην διὰ σιωπῆς, τὴν δὲ δευτέραν καὶ τρίτην διὰ προσφωνήσεως πληροῦσθαι· εἶθ᾽ οὕτω τὴν εἰρήνην δίδοσθαι· καὶ μετὰ τὸ τοὺς πρεσβυτέρους δοῦναι τῷ ἐπισκόπῳ τὴν εἰρήνην, τότε τοὺς λαϊκοὺς τὴν εἰρήνην διδόναι, καὶ οὕτω τὴν ἁγίαν προσφορὰν ἐπιτελεῖσθαι· καὶ μόνοις ἐξὸν εἶναι τοῖς ἱερατικοῖς εἰσιέναι εἰς τὸ θυσιαστήριον, καὶ κοινωνεῖν.
Parallel canons
Трул.69Лаод.44