The Sacrament of the Altar
Q62. How can bodily eating and drinking do such great things?
Certainly not just eating and drinking do these things, but the words written here: "Given and shed for you for the forgiveness of sins." These words, along with the bodily eating and drinking, are the main thing in the Sacrament. Whoever believes these words has exactly what they say: "forgiveness of sins."
Scripture Proofs — King James Version
Romans 10:17
“So then faith cometh by hearing, and hearing by the word of God.”
Luke 22:19–20
“And he took bread, and gave thanks, and brake , and gave unto them, saying, This is my body which is given for you: this do in remembrance of me. Likewise also the cup after supper, saying, This cup the new testament in my blood, which is shed for you.”
Hebrews 9:22
Read Luther’s expanded teaching
From the Large Catechism (1529)