Levítico 18

No tendrás relaciones sexuales con una mujer y al mismo tiempo a su hermana, mientras que la otra esté viva.

No tomarás mujer juntamente con su hermana, para hacerla su rival, descubriendo su desnudez delante de ella en su vida.

Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.

“‘You shall not take a wife in addition to her sister, to be a rival, to uncover her nakedness, while her sister is still alive.