Heidelberg Catechism · Lord's Day 30
80. What difference is there between the Lord's Supper and the papal Mass?
Answer
The Lord's Supper testifies to us that we have complete forgiveness of all our sins through the one sacrifice of Jesus Christ, which he himself accomplished on the cross once for all, and that through the Holy Spirit we are grafted into Christ, who with his true body is now in heaven at the right hand of the Father, and this is where he wants to be worshiped. But the Mass teaches that the living and the dead do not have forgiveness of sins through the sufferings of Christ unless Christ is still daily offered for them by the priests, and that Christ is bodily present in the form of bread and wine and should therefore be worshiped in them. Therefore the Mass is basically nothing but a denial of the one sacrifice and suffering of Jesus Christ, and an accursed idolatry.
Scripture references
Hebrews 7:27 · Hebrews 9:12 · Hebrews 9:25-28 · Hebrews 10:10-18 · John 6:63 · Colossians 3:1
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