Reservation of Consecrated Communion Elements as If They Remain the Body and Blood of Christ is Not a Lutheran Practice
Another case-in-point illustrating the reaction/over-reaction pendulum swinging. In light of the fact that some in our Lutheran Church do not highly enough regard the actual presence of the Most Holy Body and Blood of Christ, in the Venerable Blessed Sacrament of the Altar, there has developed a certain point of view that would hold that we are to reserve the remaining elements of the Lord's Supper, rather than consuming them all [the best practice], and regard these remaining elements to be the body and blood of Christ. From there, it is said that these elements should be brought to the sick and shut-in for the purpose of communining them, again, assuming they are the body and blood of Christ. This is inappropriate and not a Lutheran position.
I ran across recently Luther's position on consecrating the elements in the church and then taking them from the church's communion service to the shut-in or sick. Luther was convinced such a practice smacked of Romanism and should be done away with as quickly as possible. He said in regard to such a practice:
The sacrament of the altar is to be consumed during mass and may not be preserved in a ciborium.*
Luther's position is reflected in the Formula of Concord's discussion about the Sacrament. Nowhere is there to be found in the Book of Concord any support for "reserved consecrated elements" no matter how noble the intention is behind such a practice. Appeals to some local practices as found in Brandenburg is not adequate, since the history of the Reformation in Brandenburg reveals that the electors there were very reticent to give up Roman practices and customs.
For a thorough and detailed discussion of this issue, see Roland Ziegler's excellent article on the subject.
We should consume what is consecrated in the Divine Service out of reverence for their purpose and use as the host of Christ's body and blood. If this is not done, then they should be reverently set aside for use at another consecration, but not because they are, or remain, the body and blood of Christ. Suggesting that they remain the body and blood of Christ and as such are to be reserved is not a Lutheran belief, or practice, and should not be put forward as if it is.
* WABr 8:622-623.