Adding post thumbnail in programatically inserted post

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The post thumbnail is just saved as post meta with the key: _thumbnail_id. So after you insert the post and get the post id, you can set the post meta for that post. The $thumbnail_id is just the ID of the image you’d like to set as the thumbnail, up to you since I can’t tell from your question what this should be. 

global $user_ID;
$new_post = array(
    'post_title' => 'My New Post',
    'post_content' => 'Lorem ipsum dolor sit amet...',
    'post_status' => 'publish',
    'post_date' => date('Y-m-d H:i:s'),
    'post_author' => $user_ID,
    'post_type' => 'post',
    'post_category' => array(0)
);
$post_id = wp_insert_post($new_post);

if( ! is_wp_error( $post_id ) )
       update_post_meta( $post_id, '_thumbnail_id', $thumbnail_id );

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