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Cyclopedia of Biblical, Theological and Ecclesiastical Literature
(rehearsal of the creed). In early times the candidates for baptism were accustomed, on Maundy-Thursday, to recite publicly the creed in the presence of the bishop or presbyters, and this act was designated redditio symboli.
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McClintock, John. Strong, James. Entry for 'Redditio Symboli'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/r/redditio-symboli.html. Harper & Brothers. New York. 1870.
the Week of Proper 24 / Ordinary 29