I think it's better to use terms like "passed from the law" or "no longer binding" than "obsolete" bcause those concepts are reinforced by Matthew 5:18.
>Matthew 5:18 KJV "For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled."
>Matthew 5:18 KJV "For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled."