Order by & include array by specific post ids

I have the following:

<?php $num_cols = 2; // set the number of columns here


            $args = array(
                    'post_type' => 'testimonials',
                    'posts_per_page' => 4,
                    'orderby' => 'ID', 
                    'include' => '883, 563, 568, 106',                                  
                    'order' => ''           

                    ); 
            query_posts($args);
            if (have_posts()) :
            for ( $i=1 ; $i <= $num_cols; $i++ ) :
            echo '<div id="col-'.$i.'" class="col">';
            $counter = $num_cols + 1 - $i;
            while (have_posts()) : the_post();

            if( $counter%$num_cols == 0 ) : ?>
                <div id="box">

                <?php the_post_thumbnail('post-thumbnail', array('title' => '', 'alt' => '')); ?>



                <?php the_excerpt();?>
                </div>
                <?php endif; $counter++;
                  endwhile;
                  echo '</div>'; 
                  endfor;
                  endif; 
                wp_reset_query(); 
                ?>

I thought that simply putting the post Ids, I could have the specific posts appear, and only those posts. Unfortunately, that doesn’t seem to be the case. So I was wondering if anyone knew how I can accomplish this.

Thanks in advance!

use post__in key instead of include to get posts from the specific post ids.

$args = array(
    'post_type' => 'testimonials',
    'posts_per_page' => 4,
    'orderby' => 'ID', 
    'post__in' => array(883, 563, 568, 106),
); 

And to order posts by the given posts ids, you can use the following array.

$args = array(
       'post_type' => 'testimonials',
       'posts_per_page' => 4,
      'orderby' => 'post__in', 
      'post__in' => array(883, 563, 568, 106),
   );