This proper sanctified relationship to Christ requires that the metaphorical body of Christ which is observing it first examine its self as a church body (1 Cor. 5) for KNOWN sin and sinners that must be first removed in order to partake of the Supper and the lack of such examination and removal invalidates it as the Supper.
Second, the indivdual members of the observing church must examine themselves for sin only known to themselves. If they fail to do this, then the supper is invalidated to them as individuals (1 Cor. 11:25-30).
Hence, the proper sanctified relationship to Christ required to observe the Lord's Supper is a church body that has examined itself and removed known leaven from its midst and then individual members of that body who have examined themselves and removed known leaven in their lives.
Bro. Mark
This is a common error and really should be reconsidered by those who hold to it. The reason it is in error is it assumes that because Christ died for our sin and for this reason His body was broken that God's intent in the Lord's Supper is an examination of sin in one's life.
The context of the passage is not about sin in one's life but about the manner in which the Lord's Supper is provided. This is made clear in vs. 20-22 and then made more clear in v. 27 "unworthy manner" (ESV). It is clear that Paul's intentions was to correct the lack of reverence for Christ and His sacrifice:
1Co 11:29 For anyone who eats and drinks without discerning the body eats and drinks judgment on himself.
Even in v.34 Paul is still speaking of the manner in which the Lord'ssupper is taken:
if anyone is hungry, let him eat at home--so that when you come together it will not be for judgment. About the other things I will give directions when I come.
Sin in the live of Christians never comes into view in this passage.