So we, being many, are one body in Christ, and every one members one of another.

People's New Testament

12:5 Being many, are one body in Christ, In the church, all are related to each other as the organs of the body are related.

Wesley's Notes

12:5 So we - All believers. Are one body - Closely connected together in Christ, and consequently ought to be helpful to each other.

Matthew Henry's Concise Commentary

12:3-8 Pride is a sin in us by nature; we need to be cautioned and armed against it. All the saints make up one body in Christ, who is the Head of the body, and the common Centre of their unity. In the spiritual body, some are fitted for and called to one sort of work; others for another sort of work. We are to do all the good we can, one to another, and for the common benefit. If we duly thought about the powers we have, and how far we fail properly to improve them, it would humble us. But as we must not be proud of our talents, so we must take heed lest, under a pretence of humility and self-denial, we are slothful in laying out ourselves for the good of others. We must not say, I am nothing, therefore I will sit still, and do nothing; but, I am nothing in myself, and therefore I will lay out myself to the utmost, in the strength of the grace of Christ. Whatever our gifts or situations may be, let us try to employ ourselves humbly, diligently, cheerfully, and in simplicity; not seeking our own credit or profit, but the good of many, for this world and that which is to come.