Reference for Leviticus 18:18

וְאִשָּׁ֥ה אֶל־אֲחֹתָ֖הּ לֹ֣א תִקָּ֑ח לִצְרֹ֗ר לְגַלּ֧וֹת עֶרְוָתָ֛הּ עָלֶ֖יהָ בְּחַיֶּֽיהָ׃

And thou shalt not take a woman to her sister, to be a rival to her, to uncover her nakedness, beside the other in her lifetime.

Jastrow

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