the geneva catechism 4 (continued)
370. But our Lord admitted Judas to the Supper, impious though he was? His iniquity was still hidden, and although our Lord knew it, yet it was not evident to all.
371. What then is to be done with hypocrites? The minister cannot exclude them as unworthy, but must wait until God has revealed their iniquity.
372. But what if he knows or has been warned that someone is unworthy? That would not be sufficient to exclude him, unless there were a legitimate investigation and decision of the Church.
373. Then there ought to be some order and polity regarding this. Yes, if the Church is to be well ordered. Some persons must be appointed to watch out for the offences that may be committed. And they, with the authority of the Church, should refuse communion to those who are quite unfit, and to whom communion cannot be given without dishonouring God and scandalizing the faithful.