Levítico 18

“‘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.

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.