Rom 7:3 So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.
Rom 7:4 Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.
So we being dead to the law frees us from the law as many scriptures affirm. The old law is dead, we are then in response dead to that law and free to re-marry a new husband and law...the law of Christ no longer bound to the old law.
Clarke:
Romans 7:4
Wherefore, my brethren - This is a parallel case. You were once under the law of Moses, and were bound by its injunctions; but now ye are become dead to that law - a modest, inoffensive mode of speech, for, The law, which was once your husband, is dead; God has determined that it shall be no longer in force; so that now, as a woman whose husband is dead is freed from the law of that husband, or from her conjugal vow, and may legally be married to another, so God, who gave the law under which ye have hitherto lived, designed that it should be in force only till the advent of the Messiah; that advent has taken place, the law has consequently ceased, and now ye are called to take on you the yoke of the Gospel, and lay down the yoke of the law; and it is the design of God that you should do so.
Gill:
are become dead to the law, and that to them, as in Rom_7:6, and can have no more power over them than a law can have over dead persons, or a dead abrogated law can have over living ones. They are represented as "dead to sin", and "dead with Christ", Rom_6:2; and here, "dead to the law", as in Gal_2:19, and consequently cannot be under it; are out of the reach of its power and government, since that only has dominion over a man as long as be lives the law is dead to them; it has no power over them, to threaten and terrify them into obedience to it; nor even rigorously to exact it, or command it in a compulsory way
Matthew Henry:
I. Our first marriage was to the law, which, according to the law of marriage, was to continue only during the life of the law. The law of marriage is binding till the death of one of the parties, no matter which, and no longer. The death of either discharges both.