“Unity of the Body” From Dictionary of Biblical Words:
This is a scriptural thought, but not a scriptural expression. It is the work of the Spirit.
“Unity of the Spirit” From Dictionary of Biblical Words:
is a Scriptural expression (Eph. 4), and signifies the unity the Spirit forms in baptizing every believer with Christ’s body. This unity cannot actually be broken, but it may be practically denied through failing to keep it in the uniting bond of peace. All general outward manifestation of it has long since disappeared, and sects and human systems have taken its place.
Strong’s Dictionary of Greek Words:
Meaning:
from 1520; oneness, i.e. (figuratively) unanimity