1 Corinthians 12:12-14, 19-20

The human body has many parts, but the many parts make up one whole body. So it is with the body of Christ. Some of us are Jews, some are Gentiles, some are slaves, and some are free. But we have all been baptized into one body by one Spirit, and we all share the same Spirit. Yes, the body has many different parts, not just one part.

How strange a body would be if it had only one part! Yes, there are many parts, but only one body.