'Works' in the Bible

So I reflected on all this, attempting to clear it all up. I concluded that the righteous and the wise, as well as their works, are in the hand of God; whether a person will be loved or hated -- no one knows what lies ahead.

Go, eat your food with joy, and drink your wine with a happy heart, because God has already approved your works.

There was once a small city with a few men in it, and a mighty king attacked it, besieging it and building strong siege works against it.