Show wp_die if url form comment not emply

I removed the url from in comment block, but spammers still post comments and add links. How to rejected comment if url not empty?

Sorry fom My English.

Answers:

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Method 1

For all simple operations prior to comment submission use the action pre_comment_on_post. Like this:

add_action( 'pre_comment_on_post', function() {
    if ( !empty( $_POST['url'] ) ) {
        wp_die( 'Go away!', 'Nope', [ 'response' => 403, 'exit' => true ] );
    }
});

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