1 Corinthians 12: 12 - 14, 27
12 For just as the body is one and has many members, and all the members of the body, though many, are one body, so it is with Christ.
13 For by one Spirit we were all baptized into one body -- Jews or Greeks, slaves or free -- and all were made to drink of one Spirit.
14 For the body does not consist of one member but of many.
27 Now you are the body of Christ and individually members of it.

EWTN