<?php
include_once(ABSPATH . WPINC . '/feed.php');
$feed_url = get_post_meta($post->ID, 'Blog RSS Feed', 'true');
if ($feed_url) {
    $rss = fetch_feed($feed_url);
    $rss_items = $rss->get_items( 0, $rss->get_item_quantity(5) );
    if ( !$rss_items ) {
        echo 'no items';
    } else {
        foreach ( $rss_items as $item ) {
        echo '<p><a href="' . $item->get_permalink() . '">' . $item->get_title() . '</a></p>';
    }
}
?>