Hello @Uli10
If you look at the Airbnb Help Centre, they provide guidance on this.
If you are no longer hosting put your listing on snooze now, so you aren't taking any further bookings. You will then need to contact Airbnb you can ask their advice. My understanding is they can offer your guests to cancel their booking and find somewhere else or transfer to the new host under their new listing but I am not sure so get in contact with them ASAP to minimise any disruption to your quests.
https://www.airbnb.co.uk/help/article/476/how-do-i-snooze-or-deactivate-my-listing
If the person taking over you accommodation wants to host they can set up their own listing.