Undefine variable user, user being passed in method from route

I'm passing in the user instance through route model binding, and I'm attempting to use the user in a query.

This is the function and the query.

   public function text(User $user)
   {


            $messages = DB::table('messages')
                        ->join('threads', function($join){
                            $join->on('messages.thread_id', '=', 'threads.id')
                                 ->where('threads.id', '=', $user->threads[0]->id);
                        })->get();


     return view('backend.pending_registrations.textform', compact('user', 'messages'));


   }

I'm getting this error

Undefined variable: user

Any ideas?

via Chebli Mohamed