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Canon LXXVIII.
The Quinisext Council in Trullo (692) · The Seven Holy Ecumenical Councils
It behoves those who are illuminated to learn the Creed by heart and to recite it to the bishop or presbyters on the Fifth Feria of the Week.
Trull 1.79.2
He that is illuminated is to recite (ἀπαγγελλέτω ) the faith on the fifth feria of the week.
Trull 1.79.5