The Mass and Open Communion
This article examines Lord's Day 30 of the Heidelberg Catechism, which presents a sharp contrast between the Reformed understanding of the Lord's Supper and the Roman Catholic Mass, emphasizing Christ's once-for-all sacrifice and the exclusion of the unrepentant from communion. Kleyn addresses the controversy surrounding this catechism section and defends its teaching on proper admission to the Supper and the church's responsibility to exercise discipline through the keys of the kingdom.
Lord's Day 30 Question 80. What difference is there between the Lord's Supper and the popish mass? Answer. The Lord's Supper testifies to us that we have a full pardon of all sin by the only sacrifice of Jesus Christ, which He Himself has once accomplished on the cross; and, that we by the Holy Ghost are ingrafted into Christ, who according to His human nature is now not on earth, but in heaven at the right hand of God His Father, and will there be worshiped by us -- but the mass teaches,...
Full article available on sb.rfpa.org