'Under the Law' in the Bible

For so many as sinned without law will also perish without law; and so many as sinned under the law shall be judged by the law;

But we know that so many things as the law speaks, it says to those under the law: that every mouth may be stopped, and the whole world may become guilty before God.

For sin shall not have dominion over you: for you are not under the law, but under grace.

What then? can we commit sin, because we are not under the law, but under grace? it could not be so.