Middlewares Laravel

I am new to laravel and I have a redirection problem. I get this message on the page:

  

ERR_TOO_MANY_REDIRECTS

This happens when I put the validation of required, if I remove it if it works, could you tell me why?:

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Support\Facades\Validator;

class ValidateFields
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @param  string|null  $guard
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $validate =Validator::make($request->all(),[
            "email"=>"email",
             "password"=>"required"
            ]
        );

        if ($validate->fails()) {
          return redirect("login")->withErrors($validate);
        }

        return $next($request);
    }
}

?>