Leviticus 18:18:

Do not take your wife’s sister as a rival wife and have sexual relations with her while your wife is living.

I always wondered why it says it like this. Instead of, "do not marry your wife's sister while she is alive," it says not to take her as a "rival wife" specifically.

What does that mean?

closed as off-topic by Lee Woofenden, brasshat, BYE, KorvinStarmast, curiousdannii Sep 21 '17 at 5:15

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    I'm voting to close this question as off-topic because this would be better asked on Biblical Hermeneutics. – Lee Woofenden Sep 19 '17 at 21:44
  • @LeeWoofenden: Rather than closing it, can't it be moved instead? – Wtrmute Sep 20 '17 at 14:09
  • @Wtrmute Mods can move questions to other sites. – Lee Woofenden Sep 20 '17 at 16:44