'Fellow worker' in the Bible

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

If anyone inquires of Titus, he is my partner and fellow-worker for you, or of our brothers, they are the messengers of the churches, the glory of Christ.

Yet I thought it necessary to send to you Epaphroditus, my brother and fellow-worker, and fellow-soldier, but your messenger and he who ministered to my wants.