Booking a hotel room for someone who will use it for zina
Q: A person I know does online booking reservation for hotels and rooms for accommodation for 5 star hotels. Some of the clients that approach him are confirmed unmarried adults who want to book rooms for zina purposes. When it is 90% sure that these are unmarried and are booking for unlawful things, if I book the hotel rooms through my website, will it be halaal income or haraam income?