'Free' in the Bible

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

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

And if he do not these three unto her, then shall she go out free without money.

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

And if he smite out his manservant's tooth, or his maidservant's tooth; he shall let him go free for his tooth's sake.

And they received of Moses all the offering, which the children of Israel had brought for the work of the service of the sanctuary, to make it withal. And they brought yet unto him free offerings every morning.