I simply cannot find anywhere in Scripture saying that a pastor has the authority to withhold the means of grace, given by God from a Christian.
Pastors can and do have the responsibility to withhold that which could be spiritual harmful to an individual. He has that responsibility and authoriuty given him by God.
Matthew 18:18. "I tell you the truth, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven."
Hebrews 13:17, "Obey your leaders and submit to their authority. They keep watch over you as men who must give an account. Obey them so that their work will be a joy, not a burden, for that would be of no advantage to you."
These passages deal directly with the called office. Pastors, whose call is from God and not from Man, are the stewards of the mysteries. It is their responsibility to see to the spiritual well being of their flock.
Scripture also tells us about worthy reception of the Sacrament.
1 Corinthians 11:27-29, "Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner
will be guilty of sinning against the body and blood of the Lord. A man ought to examine himself before he eats of the bread and drinks of the cup. For anyone who eats and drinks without recognizing the body of the Lord
eats and drinks judgment on himself."
What kind of pastor does not care for the spiritual well being of people enough to keep them from bring such spiritual harm upon themselves?
We believe that God comes to us through the Holy Spirit and gives us faith, but cannot have faith that the Holy Spirit convicts us of our sins and enables us to examine ourselves before partaking? We are instead to give our spiritual health and wellbeing into the hands of a pastor who may or may not being walking in Spirit and Truth???
If your pastor is not walking in spirit and truth, I suggest you contact your congregational leadership or the circuit counsellor.
God gives us called and ordained pastors through whom He teaches and preaches His word. It is his responsibility to make sure that those who partake of the Sacrament do so to their benefit and not to their judgement. Open communion is an unloving, uncaring practice that endangers the spiritual lives of people.
It is not, nor has it ever been, the practice of the LCMS.