in its God-given context of one man and one woman
These 12 male children became the leaders of the 12 tribes of Israel. With the interesting side story of Judah and Israel splitting down the road.
So, what biblical principle of one man and one woman ? ! ?
Certainly not in the Old Testament.
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In the New Testament . . .
Jesus seems to advocate celibacy a lot. Plus, I think Paul was unmarried and said it’s better to marry than burn. Meaning, marriage is second best.
And then, there’s the absence of the positive.
Nowhere does Jesus say, husbands and wives, be considerate of each other. Hold back a harsh word etc , etc.
For example, Jesus could have said, your wife has dealt all day with children and that’s enough to drive anyone crazy. But he didn’t.
Jesus could have said, your husband has been out in the world, maybe someone has tried to cheat him, perhaps even someone he thought was a friend. But he didn’t.