A Reformed Baptist friend recently said to me that confessional Paedobaptists give the Lord's supper to believers based on the clear teaching of the New Testament
1 Cor 11:27 ff.
There's more to it than that. One verse might be enough, but the fact is that there's a whole theology of sacraments, and of the Lord's Supper in particular, that comprises "the clear teaching" of the
New Testament whole Bible on the topic.
Are there
different prerequisites for coming to the Supper, for different sorts of participants? I don't know of anyone who argues for such things, except for paedocommunion advocates. 1Cor.11:27, in the context of a teaching passage on the conduct of the Supper, is a strong argument for an unwaiverable requirement for all participants at the time it is served.
He argued that Paedobaptists are inconsistent at this point re baptism, because the clear teaching of the New Testament is to repent and be baptised. He points out there are
more commands to repent and be baptised than the command in
1 Cor 11:27 ff. How do you answer this specific argument re the relationship between Baptism and the Lord's supper.
Assume (purely for the sake of argument) that infants should be baptized. Is it then reasonable that the NT historical books should contain one or numerous instances of evangelistic proclamation, which relate repentance/faith and baptism? What would be unreasonable about such a record?
Work out the requisite premise(s), so that the actual argument purporting to show:
infants shouldn't be baptized, follows from the record of evangelistic calls that include a summons to baptism.
If (for the sake of argument) infants should be baptized, still they are in no position to comprehend this call, or the summons, or bring themselves to conform to either. In which case, the prerequisites for a confessor's baptism and for an infant's baptism would have to differ. That is all that is needed to show that appeals to (several) evangelistic calls do not invalidate the PB argument.
This, by the way, does not mean that there are two (or more) baptisms, if the meaning of baptism has no difference in either case. But if a Baptist does not see how this can possibly be the case for those of the Presbyterian persuasion, then it is probably true to conclude (presuming his views are "standard") that Baptists and Presbyterians differ at least in part on their understanding of what baptism essentially is/does/means. This contrast also gets reflected in differences over ecclesiology.
To sum up, variation in the number of passages (which might contain imperatives, 1Cor.11:27 does not have; yet v28 does) to which one may appeal for support is not alone an indicator of the relative "strength" of an argument.
A simple test of some position (whether favorable or contrary) might be persuasive to someone already of a particular mind. But generally, those are some of the least compelling to those looking on from another angle.