'Work' in the Bible

To this end, like an earnest wrestler, I exert all my strength in reliance upon the power of Him who is mightily at work within me.

Whatever you are doing, let your hearts be in your work, as a thing done for the Lord and not for men.

Tychicus, our much-loved brother, a trusty assistant and fellow servant with us in the Lord's work, will give you every information about me.