1 Corinthians 12:15, 18-20

If the foot says, “Because I am not a hand, I am not a part of the body,” it is not for this reason any the less a part of the body.

But now God has placed the members, each one of them, in the body, just as He desired. If they were all one member, where would the body be? But now there are many members, but one body.