Adam Clarke on Romans 7:1

For I speak to them that know the law - This is a proof that the apostle directs this part of his discourse to the Jews.

As long as he liveth? - Or, as long as It liveth; law does not extend its influence to the dead, nor do abrogated laws bind. It is all the same whether we understand these words as speaking of a law abrogated, so that it cannot command; or of its objects being dead, so that it has none to bind. In either case the law has no force.