6 Give back to her as she has given; pay her back double for what she has done. Pour her a double portion from her own cup.

Read Revelation 18:6 Using Other Translations

Reward her even as she rewarded you, and double unto her double according to her works: in the cup which she hath filled fill to her double.
Pay her back as she herself has paid back others, and repay her double for her deeds; mix a double portion for her in the cup she mixed.
Do to her as she has done to others. Double her penalty for all her evil deeds. She brewed a cup of terror for others, so brew twice as much for her.