'Work' in the Bible

having confidence of this very thing, that he who has begun in you a good work will complete it unto Jesus Christ's day:

So that, my beloved, even as ye have always obeyed, not as in my presence only, but now much rather in my absence, work out your own salvation with fear and trembling,

But ye know the proof of him, that, as a child a father, he has served with me in the work of the glad tidings.

because for the sake of the work he drew near even to death, venturing his life that he might fill up what lacked in your ministration toward me.