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In page Athanasian Creed:

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In Lutheranism, the Athanasian Creed is, along with the Apostles' and the Nicene Creed, one of the three ecumenical creeds and is placed at the beginning of the 1580 Book of Concord, the historic collection of authoritative doctrinal statements (confessions) of the Lutheran Church. It is still used in the liturgy on Trinity Sunday.[citation needed]