Romans 7:2-3

² For the woman who has a husband is bound by the law to her husband as long as he lives. But if the husband dies, she is released from the law of her husband.

³ So then if, while her husband lives, she marries another man, she will be called an adulteress; but if her husband dies, she is free from that law, so that she is no adulteress, though she has married another man.

law of her husband = law concerning her husband

called = to be publicly know as, branded

Mark 10:12 — And if a woman divorces her husband and marries another, she commits adultery.