'Union' in the Bible

From: Paul, an apostle of the Messiah Jesus by God's will. To: His holy and faithful people in Ephesus who are in union with the Messiah Jesus.

In union with him we have redemption through his blood, the forgiveness of our offenses, according to the riches of God's grace

even when we were [spiritually] dead and separated from Him because of our sins, He made us [spiritually] alive together with Christ (for by His grace—His undeserved favor and mercy—you have been saved from God’s judgment).

But now, in union with the Messiah Jesus, you who once were far away have been brought near by the blood of the Messiah.

In union with him the whole building is joined together and rises into a holy sanctuary for the Lord.

But we shall lovingly hold to the truth, and shall in all respects grow up into union with Him who is our Head, even Christ.

In conclusion, be strong in the Lord [draw your strength from Him and be empowered through your union with Him] and in the power of His [boundless] might.