'Prohibition' in the Bible

and Jehoshaphat cometh in, and his people, to seize their spoil, and they find among them, in abundance, both goods and carcases, and desirable vessels, and they take spoil to themselves without prohibition, and they are three days seizing the spoil, for it is abundant.

This accounts for the fact that if during her husband's life she lives with another man, she will be stigmatized as an adulteress; but that if her husband is dead she is no longer under the old prohibition, and even though she marries again, she is not an adulteress.