The Canons of the Council in Trullo 78

78 Canon LXXVIII

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.

Notes.

Ancient Epitome of Canon LXXVIII.

He that is illuminated is to recite (ἀπαγγελλέτω ) the faith on the fifth feria of the week.

This is a renewal of canon xlvi. of Laodicea.

Philip Schaff and Henry Wace (eds.), New York: Christian Literature Publishing Co., 1890-1900. Public domain: English translation first published 1885-1900 (Nicene and Post-Nicene Fathers, Second Series).