Quite possibly if you are interested in this issue, you've seen something like this. But Juan Cole's summary of what the Bible says about marriage is to the point:
But wackiest of all is the idea that the Bible sees marriage as between one man and one woman. I don’t personally get how you could, like, actually read the Bible and come to that conclusion (see below). Even if you wanted to argue that the New Testament abrogates all the laws in the Hebrew Bible, there isn’t anything in the NT that clearly forbids polygamy, either, and it was sometimes practiced in the early church, including by priests. Josephus makes it clear that polygamy was still practiced among the Jews of Jesus’ time. Any attempt to shoe-horn stray statements in the New Testament about a man and a woman being married into a commandment of monogamy is anachronistic. Likely it was the Roman Empire that established Christian monogamy as a norm over the centuries. The Church was not even allowed to marry people until well after the fall of the Western Roman Empire, since it was an imperial prerogative. Ancient scripture can be a source of higher values and spiritual strength, but any time you in a literal-minded way impose specific legal behavior because of it, you’re committing anachronism. Since this is the case, fundamentalists are always highly selective, trying to impose parts of the scripture on us but conveniently ignoring the parts even they can’t stomach as modern persons. 1. In Exodus 21:10 it is clearly written of the husband: “If he takes another wife to himself, he shall not diminish the food, clothing, or marital rights of the first wife.” This is the same rule as the Qur’an in Islam, that another wife can only be taken if the two are treated equally. 2. Let’s take Solomon, who maintained 300 concubines or sex slaves. 1 Kings 11:3: “He had seven hundred wives of royal birth and three hundred concubines, and his wives led him astray.” Led him astray! That’s all the Bible minded about this situation? Abducting 300 people and keeping them immured for sex? And the objection is only that they had a lot of diverse religions and interested Solomon in them? (By the way, this is proof that he wasn’t Jewish but just a legendary Canaanite polytheist). I think a settled gay marriage is rather healthier than imprisoning 300 people in your house to have sex with at your whim. 3. Not only does the Bible authorize slavery and human trafficking, but it urges slaves to “submit themselves” to their masters. It should be remembered that masters had sexual rights over their property assuming the slave-woman was not betrothed to another, and so this advice is intended for concubines as well as other slaves. And, the Bible even suggests that slaves quietly accept sadism and cruelty from their masters: 1 Peter 2:18:And there is more... Image: Abraham's family. Don't get me started.