'Free' in the Bible

If thou buy a Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing.

But if the servant shall plainly say, I love my master, my wife, and my children; I will not go out free:

And if a man smite the eye of his servant, or the eye of his maid, and destroy it; he shall let him go free for his eye's sake.

And if he smite out his man-servant's tooth, or his maid-servant's tooth, he shall let him go free for his tooth's sake.