You can use get_post_field() function to get the post content by post id.

$post_id = 129;
if( get_post_status( $post_id ) == 'publish' ) {
    echo get_post_field( 'post_content', $post_id );
}

You can use get_post() function to get the post content by post id.

$post_id = 129;
if( get_post_status( $post_id ) == 'publish' ) {
     
    $post_content = get_post($post_id);
    $content = $post_content->post_content;
    echo apply_filters('the_content',$content);
}

You can use get_post_field() function to get the post content by post id.

<?php
            $post_id = 129;
                if (get_post_status ( $post_id ) == 'publish') {
                    echo get_post_field('post_content', $post_id);;
                }
            ?>

You can use get_post_field() function to get the post content by post id.

$post_id = 129;
if( get_post_status( $post_id ) == 'publish' ) {
    echo get_post_field( 'post_content', $post_id );
}