Romans 7:3

So then if while her husband liveth
True indeed it is, that whilst her husband is alive, if

she be married to another man, she shall be called an adulteress;
she will be noted and accounted of as such everybody, except in the above mentioned cases:

but if her husband be dead;
then there can be no exception to her marriage:

she is free from the law;
of marriage, by which she was before bound:

so that she is no adulteress;
nor will any reckon her such; she is clear from any such imputation:

though she be married to another man;
hence it appears that second marriages are lawful.