Passing parameter inside method in foreach

I have the index that contains my call of class CRUD and foreach calling the method of class crud . But within foreach I'm trying to pass the table name parameter, but it does not show anything. If I take the parameter and put the table name inside the method, it works fine. I do not know what to do! = /

Index:

<?php
     require_once('classes/crud.class.php');
     $mostrarpar = new crud();

?>
<?php foreach ($mostrarpar->Listar('moedas_par') as $res) { ?>
     <li><?php echo $res['par_nome']; ?></li>
<?php } ?>

CRUD:

public function Listar($table) {
    $this->query = $this->setConn()->prepare("SELECT * FROM'.$table.'");
    $this->query->execute();
    return $this->query->fetchall(PDO::FETCH_ASSOC);
}