1 Corinthians 12:15, 18-20

So if the foot were to say, “Since I’m not a hand, I’m not a part of the body,” it’s forgetting that it is still a vital part of the body.

But God has carefully designed each member and placed it in the body to function as he desires. A diversity is required, for if the body consisted of one single part, there wouldn’t be a body at all! So now we see that there are many differing parts and functions, but one body.