We are one in Christ
Apostle Paul wrote to Christians in Ephesia:
But now in Christ Jesus you who once were far away have been brought near through the blood of Christ.
For he himself is our peace, who has made the two one and has destroyed the barrier, the dividing wall of hostility,
by abolishing in his flesh the law with its commandments and regulations. His purpose was to create in himself one new man out of the two, thus making peace,
and in this one body to reconcile both of them to God through the cross, by which he put to death their hostility.
He came and preached peace to you who were far away and peace to those who were near.
For through him we both have access to the Father by one Spirit.
Consequently, you are no longer foreigners and aliens, but fellow citizens with God's people and members of God's household,
- Ephesians 2:14-19