As orthodox, confessional Lutherans, we embrace as our primary confessions of faith the Symbolical Books of the Evangelical Lutheran Church contained in the Book of Concord of 1580, namely, the Apostles’, Nicene, and Athanasian Creeds; the Augsburg Confession and its Apology; the Smalcald Articles (including the Treatise on the Power and Primacy of the Pope); Luther’s Small and Large Catechisms and the Formula of Concord (Epitome and Solid Declaration). We accept these Confessions, not in so far as but because they agree with Scripture, and we believe that they are a correct exposition of the teaching of God’s Word. Adherence to these confessions, drawn from Scripture, is in keeping with St. Peter’s exhortation: “Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have” (1 Pet. 3:15). See also Heb. 13:7-9a.

From the Evangelical Lutheran Synod website: