Heidelberg Catechism · Lord's Day 30
82. Should those also be admitted to the Lord's Supper who by their confession and life show that they are unbelieving and ungodly?
Answer
No, for then the covenant of God would be profaned and his wrath kindled against the whole congregation. Therefore, according to the command of Christ and his apostles, the Christian Church is duty-bound to exclude such persons by the keys of the kingdom of heaven until they amend their lives.
Scripture references
Question 82 of 129
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