'Fellow worker' in the Bible

Timothy my fellow worker, and Lucius, and Jason, and Sosipater, my kinsmen, greet you.

If any do inquire of Titus, he is my partner and fellow worker concerning you: or if our brethren be inquired of, they are the messengers of the churches, and the glory of Christ.

And sent Timothy, our brother, and minister of God, and our fellow worker in the gospel of Christ, to establish you, and to encourage you concerning your faith: