1 Corinthians 12:12-13

12Each person has only one body, but that body has many parts. All those different parts make only one body. It is like that with Christ too.

13When they baptized us, we all became parts of one body. It was the one Spirit who brought us together. It made no difference whether we were Jews or Gentiles. It made no difference whether we were slaves or free people. God poured his one Spirit into all of us.