Display single post with slug on other pages

test-page-template.php

<?php
/*
* Template Name: Test Page
*
*/

//please change this as your wish
// you can inser the post slug which you want to render
$post_slug = 'the-new-post_slug';

//query args
$args = array(
		'post_type'	=> 'post',
		'name'		=> $post_slug
	);
$myposts = get_posts( $args );
/*
* Now $myposts have all the info of $post_slug
*/
foreach ( $myposts as $post ) : setup_postdata( $post );
		//title of the post
		the_title();
		//content of the post
		the_content();
		//featured image of the post
		the_post_thumbnail();
endforeach;
//reset the current query
wp_reset_postdata();

/*
* Note :  Please create new test page and assign this template and enjoy.
*/
?>