How to call the first comment of a wordpress article outside the Article Page

It is best to call a system function, not a database, instead of a system function.

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It is best to call system functions instead of databases.

I do not know this function. You need to write it yourself.
You can

Wp-shortdes/comment. php

Add a funciton

Function get_first_approved_comment ($ post_id) {global $ wpdb; return $ wpdb-> get_results ($ wpdb-> prepare ("SELECT * FROM $ wpdb-> comments WHERE comment_post_ID = % d AND comment_approved = '1' order by comment_date DESC limit 1", $ post_id ));}