Therefore also it is vain talk when they say that the body and blood of Christ are not given and shed for us in the Lord’s Supper, hence we could not have forgiveness of sins in the Sacrament. For although the work is accomplished and the forgiveness of sins acquired on the cross, yet it cannot come to us in any other way than through the Word. For what would we otherwise know about it, that such a thing was accomplished or was to be given us if it were not presented by preaching or the oral Word? Whence do they know of it, or how can they apprehend and appropriate to themselves the forgiveness, except they lay hold of and believe the Scriptures and the Gospel? But now the entire Gospel and the article of the Creed: I believe a holy Christian Church, the forgiveness of sin, etc., are by the Word embodied in this Sacrament and presented to us. Why, then, should we allow this treasure to be torn from the Sacrament when they must confess that these are the very words which we hear every where in the Gospel, and they cannot say that these words in the Sacrament are of no use, as little as they dare say that the entire Gospel or Word of God, apart from the Sacrament, is of no use?
via The Large Catechism – Book of Concord (V.31–32)