If it is the church’s responsibility to fence the Table, to keep people away from it who aren’t going to partake in a worthy manner, then that implies a whole authority structure to make that happen. Only certain authorized people can serve communion, only at appointed places and times, and so on. The Roman and Eastern churches certainly took that position, and speaking broadly, so did the fathers of the Reformation. The marks of a true church, our Reformed fathers said, were word, sacrament, and discipline, and part of the function of discipline was to fence the Table. It was therefore possible in a Reformation church for a member of the church to be encouraged to come to church, but suspended from the Table as a disciplinary measure. At a commonsense level, it’s not hard to see how they got there — it’s the ecclesiastical equivalent of sending a child to bed without his supper.
The New Testament knows nothing of such a practice. There are no appointed places and times. When did the NT church gather that was *not* church? They didn’t have a church building; it was all houses. They didn’t have Sunday mornings off from work. They gathered where and when they could, and when they gathered, the church was gathering. There are no authorized servers, no one appointed to fence the table. Is it ok to serve the Lord’s Table in a private residence to a bunch of your close friends on a Thursday night? Well, WWJD? That’s how the first one happened…. The church’s role is to celebrate early and often, and invite the world to come.
There is, of course, a warning that the one who partakes in an unworthy manner eats and drinks judgment to himself. (In the immediate context, the unworthy partaking is a matter of the rich shaming the poor.) But there is no suggestion that the elders should stop someone from partaking because he might be doing it unworthily. The only examination Paul commands is self-examination. Nobody else is responsible to do it for you, and God has not delegated that authority to anyone.
An egregiously sinning, unrepentant believer may be expelled from the community entirely until he repents, but there’s no concept of allowing him to remain in the community without coming to the Table. If he is spiritually weak, then he needs strength; why would you withhold spiritual food from him?
The Table is pure grace. You want Jesus? Then come to the Table. Is it blasphemy for some spiritual tourist to come and partake of the body and blood of Christ as an act of curiosity, with no regard for what he’s really doing? Yes, of course.
But it’s not my blasphemy; it’s God’s. Jesus incarnated in the world and gave His body to and for the world; He gave His body to be abused and crucified by sinners. Some heathen getting away with a wafer is the very least of the blasphemy going on here; why would that be where we draw the line? You don’t have the right to fence the Lord’s Table because it’s not your table; it’s His.