The human body has many parts, but the many parts make up only one 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 Christ's body by one Spirit, and we have all received the same Spirit.
References for 1 Corinthians 12:13
Yes, the body has many different parts, not just one part.
If the foot says, "I am not a part of the body because I am not a hand," that does not make it any less a part of the body.
And if the ear says, "I am not part of the body because I am only an ear and not an eye," would that make it any less a part of the body?
Suppose the whole body were an eye -- then how would you hear? Or if your whole body were just one big ear, how could you smell anything?
But God made our bodies with many parts, and he has put each part just where he wants it.
What a strange thing a body would be if it had only one part!
Yes, there are many parts, but only one body.
The eye can never say to the hand, "I don't need you." The head can't say to the feet, "I don't need you."
In fact, some of the parts that seem weakest and least important are really the most necessary.
And the parts we regard as less honorable are those we clothe with the greatest care. So we carefully protect from the eyes of others those parts that should not be seen,
while other parts do not require this special care. So God has put the body together in such a way that extra honor and care are given to those parts that have less dignity.
This makes for harmony among the members, so that all the members care for each other equally.