6 Whoever sits on anything that the man with a discharge sat on must wash their clothes and bathe with water, and they will be unclean till evening.

Read Leviticus 15:6 Using Other Translations

And he that sitteth on any thing whereon he sat that hath the issue shall wash his clothes, and bathe himself in water, and be unclean until the even.
And whoever sits on anything on which the one with the discharge has sat shall wash his clothes and bathe himself in water and be unclean until the evening.
If you sit where the man with the discharge has sat, you must wash your clothes and bathe yourself in water, and you will remain unclean until evening.