1 Corinthians 10:17

For we being many are one bread, and one body: for we are all partakers of that one bread (KJV)

Then: Here is the platform for the questions in verse 16. All who eat form one unit, one body, as they partake of the bread. None in the body should be simultaneously associated with worshiping in a temple. Dunn and Rogerson (p. 1335) push forward to other verses and distinguish three kinds of meals: Communion in the church, meals in Corinth's temples, and meals eaten by the Israelites. Corinthians should conclude that eating in the temples belied their belief in the Lord. Dunn and Rogerson also intimate what Dr. Magness points out in class notes. This verse is a remarkable precursor for Paul's comparison of the members of a church being members of a human body - each with distinct purposes and functions designated for the good of the whole.

Now: The church still partakes of one bread while being one body - symbolically during the time of a communion meal and actually, as members serve doing his will throughout their earthly lives.

Extra source: Eerdmans commentary on the Bible by James D. G. Dunn, John William Rogerson on line at http://books.google.com/books?id=2Vo-11umIZQC&pg=PA1353&lpg=PA1353&dq=1+Corinthians+9+commentary&source=bl&ots=5QeQaYWrMS&sig=S5F3KcA_TvNMyywqRiimySoUYtc&hl=en&ei=QqHPSouICIWj8AaZxqyABA&sa=X&oi=book_result&ct=result&resnum=8&ved=0CBkQ6AEwBzgU#v=onepage&q=1%20Corinthians%209%20commentary&f=false