How To Use A Page Template Anywhere In WordPress Using Template Include

add_filter( 'template_include', 'front_page_landing_template', 99 );

function front_page_landing_template( $template ) {

<pre><code>if ( is_front_page()  ) {
    $new_template = locate_template( array( 'page_landing.php' ) );
    if ( '' != $new_template ) {
        return $new_template ;
    }
}

return $template;
</code></pre>

}