Canon 78
That those preparing for baptism must undergo training in the basics of the faith.
Those who are enlightened must study the doctrine and on the 5th day of the week give a report to the bishop or elders.
Greek original
Ὅτι δεῖ τοὺς φωτιζομένους τὴν πίστιν ἐκμανθάνειν, καὶ τῇ πέμπτῃ τῆς ἑβδομάδος ἀπαγγέλλειν τῷ ἐπισκόπῳ, ἢ τοῖς πρεσβυτέροις.
Parallel canons
IВс.214Трул.96Лаод.1946