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<?php
// ALL parameters are optional. Not needed if you are on WP LOOP
echo get_the_post_thumbnail_url( $the_query->ID, array( 500, 400) ); ?>
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$img_url = wp_get_attachment_image_url(get_post_thumbnail_id(get_the_ID()), 'full');
<img src="<?PHP echo $img_url?> ">