'Fellow worker' in the Bible

Suppose he goes with someone else to the forest to cut wood and when he raises the ax to cut the tree, the ax head flies loose from the handle and strikes his fellow worker so hard that he dies. The person responsible may then flee to one of these cities to save himself.

Greet Urbanus, our fellow worker in Christ, and my good friend Stachys.

Timothy, my fellow worker, greets you; so do Lucius, Jason, and Sosipater, my compatriots.

If there is any question about Titus, he is my partner and fellow worker among you; if there is any question about our brothers, they are messengers of the churches, a glory to Christ.

We sent Timothy, our brother and fellow worker for God in the gospel of Christ, to strengthen you and encourage you about your faith,