I think this code will help you:
$src = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full', false, '' );
echo '<img src="'.$src[0].'">';
I think this code will help you:
$src = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full', false, '' );
echo '<img src="'.$src[0].'">';