Do not take your wife’s sister as a rival wife and have sexual relations with her while your wife is living.
In March of 1843 Joseph Smith took two sisters, Emily and Eliza Partridge as polygamous wives. (Actually he married them twice but that’s another story.) In discussing Old Testament polygamy, defenders of latter-day polygamy are quick to point out the provisions and restrictions on polygamy listed in the Bible as justification.
As interesting as polygamy is, this post is not about that.
A problem I think Evangelicals and Mormons encounter in discussing Biblical doctrine is that we’re really not on the same playing field. We have different rules for its application. We Evangelicals want to show why Mormonism is false by illustrating through the Bible why Mormon doctrine is in contradiction to the teachings of Jesus and the apostles. The slipperiness or non-existence of Mormon doctrine not withstanding, this is a difficult proposition.
It is difficult for one reason. Despite the fact that Mormons claim that the Bible is scripture and hold it up as such, the Bible will always take a seat when something Joseph Smith said or did comes in contradiction to it. Joseph can do or say anything because he says he’s a prophet with authority over the Bible. I point out the passage from Numbers as an illustration of this. Here on one hand, we have a clear Biblical passage restricting polygamous wives from being sisters. On our other hand we have Joseph Smith’s direct violation of this commandment. Mormons will wave this off quite simply by saying “But God commanded him to do it.”
So it seems that no matter how clearly the Bible might or might not illuminate to us that there is and only will be ONE God, it’s generally fruitless for me to point it out because Joseph was told something different. Mormons will always hold the words of Joseph Smith over the words of the Bible.
What troubles me about that is that I have friends who are willing to reject teachings of the Bible in favor of something one man merely says Gold told him. There is no evidence for any of Joseph’s revelation whether it is the plurality of gods or the plurality of wives that anyone experienced other than Joseph Smith. The only thing anyone has ever had to go on is “because Joseph said it was true” (and perhaps “I’ve got a good feeling about it”).
I could point out Biblical passages which instruct us to accept new prophecy only when it conforms to scripture. But here again, there’s no point in directing Mormons to the Bible, as long as Joseph tells them that his new revelations supercede scripture and they decide to take his word for it.