Leviticus 18:18

¹⁸ And thou shalt not take a wife to her sister, to be a rival [to her], to uncover her nakedness, besides the other in her life-time.

Commentary on this verse

By Henry MacLagan

Verse 18. Neither is it lawful to profane the truth by contamination with differing collateral falsities in the understanding at the same time, for this produces a conflict of falsities.