Christ as the head of an undivided body:

Colossians 1:18 And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence (superiority).

Ephesians 1:22 And hath put all things under his feet, and gave him to be the head over all things to the church,

Colossians 1:24 Who now rejoice in my sufferings for you, and fill up that which is behind of the afflictions of Christ in my flesh for his body's sake, which is the church:

Acts 20:28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.

Ephesians 4:4 There is one body, and one Spirit, even as ye are called in one hope of your calling;