How to retrieve a record from a parent table based on its id on a child table – Laravel

I have two related models in a job listing application, Company and Listing. The relationship between them is that company may have listing and a listing must have exactly one company.

class Company extends Model
{
    use HasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'name',
        'description',
        'email',
        'website',
        'logo',
        'address',
        'city',
        'state',
    ];

    
    //Relationship to Listing
    public function listings(){
        return $this->hasMany(Listing::class, 'company_id');
    }
    //Relationship to company_image
    public function company_image(){
        return $this->hasMany(CompanyImage::class, 'company_id');
    }
    //Relationship to User
    public function user(){
        return $this->belongsTo(User::class, 'user_id');
    }
}

The listing model is defined as

class Listing extends Model
{
    use HasFactory;

    //Relationship to User
    public function user(){
        return $this->belongsTo(User::class, 'user_id');
    }

    //Relationship to Company
    public function company(){
        return $this->belongsTo(Company::class, 'company_id');
    }

I tried

public function edit(Listing $listing)
    {
        $cid = $listing->only(['id']); //to get the id of the company from the listings table
        $cid = $cid['id'];
        $comp =  Company::orderby('name','Asc')->get(); // this list all company in a select field
        $company = Company::whereHas('listings', function ($query) { //to get record of the company using the $cid from the listings table
            $query->where('listings.id','=',$cid);
        })->get();
        dd($company); //to check the value returned.
        // return view('listings.edit',[
        //     'listing' => $listing,
        //     'company' => $company, 
        //     'companys' => $comp
        // ]);
    }

i get an Undefined variable $cid when i use it like so where(‘listings.id’,’=’,$cid).
i get null when i use it like so where(‘listings.id’,’=’,’$cid’).

I want to get a result like

SELECT companies.name, companies.logo FROM companies join listings on listings.company_id = companies.id where listings.id = 4

which looks like:
enter image description here