How to add multiple post in single wordpress page as per post id

Question

I can try this code in page text but not working

<?php
$post_id = '138'; 
echo get_post_field('post_content', $post_id); 
?>

show a code only not display content, provide solutions in which file I can add this code.

Answer 1

wordpress提供insert_pages插件，并在此插件的页面中添加帖子或其他页面标题，内容等