<?php
include_once(ABSPATH.WPINC.'/rss.php'); // path to include script
$feed = fetch_rss('http://domain.tld/your-feed/'); // specify feed url
$items = array_slice($feed->items, 0, 7); // specify first and last item
?>
<?php if (!empty($items)) : ?>
<?php foreach ($items as $item) : ?>
<h2><a href="<?php echo $item['link']; ?>"><?php echo $item['title']; ?></a></h2>
<p><?php echo $item['description']; ?></p>
<?php endforeach; ?>
<?php endif; ?>
Some useful variables:
$item[‘link’] – post permalink
$item[‘title’] – title of the post
$item[‘pubdate’] – post publication date
$item[‘description’] – post excerpt or content
$item[‘creator’] – post author
$item[‘content’] – post content