'Union' in the Bible

From: Paul and Timothy, servants of the Messiah Jesus. To: All the holy ones in Philippi, along with their overseers and ministers, who are in union with the Messiah Jesus.

Nay, I even reckon all things as pure loss because of the priceless privilege of knowing Christ Jesus my Lord. And for His sake I have suffered the loss of everything, and reckon it all as mere refuse, in order that I may win Christ and be found in union with Him,

Then God's peace, which goes far beyond anything we can imagine, will guard your hearts and minds in union with the Messiah Jesus.

Greet every saint who is in union with the Messiah Jesus. The brothers who are with me send their greetings to you.