Answer: In Christ, we believers who are many form one body, and each member [of this one body] belongs to all the others, (verse 5).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
1 Corinthians 6:15 says that the believers' bodies are members of Christ Himself.
1 Corinthians 12:12-13 says that, "The body is a unit, though it is made up of many parts; and though all its parts are many, they form one body. So it is with Christ. For we were all baptized by One Spirit into One body--whether Jews or Greeks, slave or free--and we were all given the One Spirit to drink."
