beforeFilter and App::instance

I've created a filter which I'd like to use as a beforeFilter. It's working fine. Now, I would like to share some eloquent model from the database with the application (so I don't have to query the db again) , using App::instance('foo', $bar), but when I try to access it with App::make('foo') I get an exception: ReflectionException Class foo does not exist.

Is it possible or am I on totally wrong track?