Paragraph 24.1
Of the Westminster Confession of Faith (1646)
Marriage is to be between one Man and one Woman: neither is it lawful for any Man to have more then one Wife, nor for any Woman to have more then one Husband; at the same time.1
The 1689 Baptist Confession
25.1
Marriage is to be between one Man and one Woman; neither is it lawful for any Man to have more than one Wife, nor for any Woman to have more than one Husband at the same time.1